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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN/EAN: 5906301811565

5.00
Load capacity 9.31 kg / 91.33 N Magnetic Induction 275.57 mT / 2756 Gs
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
product specifications »

4.87 zł with VAT / pcs + price for transport

3.96 zł net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Specifications as well as shape of a neodymium magnet can be tested on our force calculator.

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Technical of the product - MPL 40x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020150
GTIN/EAN 5906301811565
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 40 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.31 kg / 91.33 N
Magnetic Induction ~ ? 275.57 mT / 2756 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x4 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Technical analysis of the magnet - report

These data are the direct effect of a physical analysis. Results rely on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Treat these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - power drop
MPL 40x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2755 Gs
275.5 mT
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
 medium risk
1 mm 2413 Gs
241.3 mT
 7.14 kg / 15.75 pounds
7143.1 g / 70.1 N
 medium risk
2 mm 2044 Gs
204.4 mT
 5.13 kg / 11.31 pounds
5128.9 g / 50.3 N
 medium risk
3 mm 1703 Gs
170.3 mT
 3.56 kg / 7.85 pounds
3559.5 g / 34.9 N
 medium risk
5 mm 1173 Gs
117.3 mT
 1.69 kg / 3.72 pounds
1688.2 g / 16.6 N
 weak grip
10 mm 522 Gs
52.2 mT
 0.33 kg / 0.74 pounds
334.9 g / 3.3 N
 weak grip
15 mm 277 Gs
27.7 mT
 0.09 kg / 0.21 pounds
94.2 g / 0.9 N
 weak grip
20 mm 163 Gs
16.3 mT
 0.03 kg / 0.07 pounds
32.8 g / 0.3 N
 weak grip
30 mm 69 Gs
6.9 mT
 0.01 kg / 0.01 pounds
5.8 g / 0.1 N
 weak grip
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 weak grip
Magnetic force drops drastically per each millimeter of distance. Remember that even a microscopic distance (e.g., contamination, paint, rust) noticeably weakens the grip. Magnets operate strongest at the point of direct contact; air break drastically cuts the force. Observe how rapidly the pull force fall, when the magnet does not touch tightly to the steel surface. When calculating the assembly, discard additional spacers.

Table 2: Slippage load (wall)
MPL 40x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
1 mm Stal (~0.2) 1.43 kg / 3.15 pounds
1428.0 g / 14.0 N
2 mm Stal (~0.2) 1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.71 kg / 1.57 pounds
712.0 g / 7.0 N
5 mm Stal (~0.2) 0.34 kg / 0.75 pounds
338.0 g / 3.3 N
10 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the estimated shear load needed to cause the downward movement of the magnet vertically along a vertical steel plate (assuming typical friction coefficient). The holding force is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 6.16 pounds
2793.0 g / 27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
When hanging a holder on a upright plane (e.g., a car body), it will maintain just about 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that holders move down easier than they detach. Planning a hanger? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter weight. Using a rubber pad can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.93 kg / 2.05 pounds
931.0 g / 9.1 N
1 mm
25%
 2.33 kg / 5.13 pounds
2327.5 g / 22.8 N
2 mm
50%
 4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
3 mm
75%
 6.98 kg / 15.39 pounds
6982.5 g / 68.5 N
5 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
10 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
11 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
12 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
A thin sheet is not enough to absorb the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To achieve the maximum of this magnet's potential, you require a sufficiently solid backing of steel. The saturation effect causes that on thin elements (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (material behavior) - thermal limit
MPL 40x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
 OK
40 °C -2.2% 9.11 kg / 20.07 pounds
9105.2 g / 89.3 N
 OK
60 °C -4.4% 8.90 kg / 19.62 pounds
8900.4 g / 87.3 N
80 °C -6.6% 8.70 kg / 19.17 pounds
8695.5 g / 85.3 N
100 °C -28.8% 6.63 kg / 14.61 pounds
6628.7 g / 65.0 N
Ordinary NdFeB products change their properties parameters above the temperature limit. Avoid high temperatures – high temperature can permanently destroy this product. With increasing heat, the neodymium's capacity momentarily decreases. Do not use this product close to ovens exceeding its operating temperature limit. Too high temperature will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.71 kg / 41.25 pounds
4 164 Gs
2.81 kg / 6.19 pounds
2807 g / 27.5 N
 N/A
1 mm 16.57 kg / 36.53 pounds
5 185 Gs
2.49 kg / 5.48 pounds
2486 g / 24.4 N
 14.91 kg / 32.88 pounds
~0 Gs
2 mm 14.36 kg / 31.65 pounds
4 826 Gs
2.15 kg / 4.75 pounds
2153 g / 21.1 N
 12.92 kg / 28.48 pounds
~0 Gs
3 mm 12.24 kg / 26.98 pounds
4 455 Gs
1.84 kg / 4.05 pounds
1836 g / 18.0 N
 11.01 kg / 24.28 pounds
~0 Gs
5 mm 8.61 kg / 18.98 pounds
3 737 Gs
1.29 kg / 2.85 pounds
1291 g / 12.7 N
 7.75 kg / 17.08 pounds
~0 Gs
10 mm 3.39 kg / 7.48 pounds
2 346 Gs
0.51 kg / 1.12 pounds
509 g / 5.0 N
 3.05 kg / 6.73 pounds
~0 Gs
20 mm 0.67 kg / 1.48 pounds
1 045 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
 0.61 kg / 1.34 pounds
~0 Gs
50 mm 0.03 kg / 0.06 pounds
207 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
60 mm 0.01 kg / 0.03 pounds
138 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
70 mm 0.01 kg / 0.01 pounds
96 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
69 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
51 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet combination. The setup of two magnets creates a more powerful interaction and a wider radius of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density between like poles is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
* Figures apply to shear force of two matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MPL 40x10x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a real danger to electronic devices as well as medical implants. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MPL 40x10x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.25 km/h
(6.74 m/s)
 0.27 J
30 mm 24.84 km/h
(6.90 m/s)
 0.29 J
50 mm 24.85 km/h
(6.90 m/s)
 0.29 J
100 mm 24.86 km/h
(6.91 m/s)
 0.29 J
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
MPL 40x10x4 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 40x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter for generator designers as well as sensors. Pc value determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 40x10x4 / N38

Environment Effective steel pull Effect
Air (land) 9.31 kg Standard
Water (riverbed) 10.66 kg
(+1.35 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Thermal stability

*For N38 material, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR

Chemical composition

iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%

Sustainability

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020150-2026
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Model MPL 40x10x4 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 91.33 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 9.31 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x10x4 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x10x4 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x10x4 / N38 model is magnetized through the thickness (dimension 4 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 4 mm (thickness). The key parameter here is the holding force amounting to approximately 9.31 kg (force ~91.33 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold, or silver gives an visually attractive appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to modularity in designing and the capacity to modify to unusual requirements,
  • Significant place in advanced technology sectors – they are commonly used in data components, electric drive systems, advanced medical instruments, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets: tips and applications.
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing executed under the following configuration:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • characterized by even structure
  • with total lack of distance (no impurities)
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

Bear in mind that the application force will differ depending on elements below, starting with the most relevant:
  • Distance – existence of foreign body (rust, dirt, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Plate thickness – too thin sheet does not close the flux, causing part of the power to be lost into the air.
  • Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Thermal limits

Avoid heat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Material brittleness

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Crushing force

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Cards and drives

Data protection: Neodymium magnets can damage payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Combustion hazard

Mechanical processing of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Powerful field

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Danger to the youngest

NdFeB magnets are not toys. Accidental ingestion of several magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates urgent medical intervention.

Precision electronics

Note: rare earth magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.

Allergic reactions

It is widely known that nickel (standard magnet coating) is a common allergen. If you have an allergy, prevent touching magnets with bare hands or select coated magnets.

Important! Want to know more? Check our post: Are neodymium magnets dangerous?