Demagnetization is the reduction or elimination of magnetization. One way to do this is to heat the object above its Curie temperature, where thermal fluctuations have enough energy to overcome exchange interactions, the source of ferromagnetic order, and destroy that order. Another way is to pull it out of an electric coil with alternating current running through it, giving rise to fields that oppose the magnetization.

One application of demagnetization is to eliminate unwanted magnetic fields. For example, magnetic fields can interfere with electronic devices such as cell phones or computers, and with machining by making cuttings cling to their parent.

magnetic fields of weak magnet

magnetic fields of weak magnet

We’ll show how a neodymium magnet can replace the weak or broken magnet. It’s a simple, fast solution that’s stronger and won’t tend to demagnetize over time.

In our previous article about Magnetic Cabinet Closures, we discussed a few ways neodymium magnets could be used as magnetic latches or closures for cabinet doors. We ended with a teaser about how neodymium magnets might be used to re-magnetize an old closure with a ceramic magnet to be as strong as it was when new. Let’s do it!

For those with more technical interest, we’ll also demonstrate how to re-magnetize a ceramic magnet using a pair of neodymium magnets. We’ll stay focused on the cabinet closure for this example, but the advice applies to other re-magnetizing situations as well. We hear questions about remagnetize old magnets in magnetos, old engine ignition systems, audio speakers, motors and generators. The same methods hopefully apply to some of those magnets too.

N50 15 x 6.5 x 2 mm Nickel-Copper- Nickel Coated Neo Magnets

N50 15 x 6.5 x 2 mm Nickel-Copper- Nickel Coated Neo Magnets

N50 15 x 6.5 x 2 mm Nickel-Copper- Nickel Coated Neo Magnets, Neo Blocks, Raw Magnet, Strong Sintered Ndfeb Block Magnet Neo Magnets Specification: Part No.: HSNB-15-6.5-2-N50Ni Magnetisation Grade: N50 Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Block, Rectangular, Rectangle, Square Magnet Size: Total Length (L): 15 mm Total Width (W): 6.5 mm Total Thickness […]

N45 15 x 5 x 2 mm Nickel Coated Rectangular Neo Magnet

N45 15 x 5 x 2 mm Nickel Coated Rectangular Neo Magnet

N45 15 x 5 x 2 mm Nickel Coated Rectangular Neo Magnet, Neo Rare Earth Bar Magnet, Super Strength Block Magnet, N45 Magnets Rectangular Neo Magnet Specification: Part No.: HSNB-15-5-2-N45Ni Magnetisation Grade: N45 Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Block, Rectangular, Rectangle, Square Magnet Size: Total Length (L): 15 mm Total Width […]

Neodymium Block Magnet N40 15 x 5 x 5 mm Nickel Coating

Neodymium Block Magnet N40 15 x 5 x 5 mm Nickel Coating

Neodymium Block Magnet N40 15 x 5 x 5 mm Nickel Coating, Neodymium Rare Earth Block Magnet, Super Strength Rectangle Magnet, N40 Magnets Neodymium Block Magnet Specification: Part No.: HSNB-15-5-5-N40Ni Magnetisation Grade: N40 Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Block, Rectangular, Rectangle, Square Magnet Size: Total Length (L): 15 mm Total Width […]

Block Super Strength Magnet 100 °C N45M 15 x 3 x 2 mm

Block Super Strength Magnet 100 °C N45M 15 x 3 x 2 mm

Block Super Strength Magnet 100 °C  N45M 15 x 3 x 2 mm, Super Powerful Block Magnet, Super Extra Strong Rectangular Magnet Super Strength Magnet Specification: Part No.: HSNB-15-3-2-N45MNi Magnetisation Grade: N45M Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Block, Rectangular, Rectangle, Square Magnet Size: Total Length (L): 15 mm Total Width (W): […]

Rare Earth Block Magnets N45H 12 x 7 x 2 mm

Rare Earth Block Magnets N45H 12 x 7 x 2 mm

Rare Earth Block Magnets N45H 12 x 7 x 2 mm, Neodymium Rare Earth Block Magnet, Super Strength Magnet, 120 °C  Super Power Magnet Rare Earth Block Magnets Specification: Part No.: HSNB-12-7-2-N40Ni Magnetisation Grade: N45H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Block, Rectangular, Rectangle, Square Magnet Size: Total Length […]

Rectangle Magnets N42 12 x 8 x 4 mm

Rectangle Magnets N42 12 x 8 x 4 mm

Rectangle Magnets N42 12 x 8 x 4 mm, Neodymium-Iron-Boron Rectangular Permanent Magnets, Strong Rare Earth Neo Rectangle Magnet Rectangle Magnets Technical Specification: Part No.: HSNB-12-8-4-N42Ni Magnetisation Grade: N42 Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Block, Rectangular, Rectangle, Square Magnet Size: Total Length (L): 12 mm Total Width (W): 8 mm Total Thickness (T): […]