Bonded permanent magnets

A flexible permanent magnet composition comprising:

• a nitrile rubber comprising about 23-37% acrylonitrile;
• an ethylene vinyl acetate copolymer;
• a precipitated amorphous silica;
• and
• a plurality of atomized, generally spherical magnet particles of a Ne—Fe—B alloy having a size distribution including a median particle size in the range of about 35-55 μm with a standard deviation in the range of about 10-30 μm and less than about 0.1% of the particles having a diameter above about 115 μm.

A permanent magnet comprising:

• a nitrile rubber comprising about 23-37% acrylonitrile;
• an ethylene vinyl acetate copolymer;
• a precipitated amorphous silica;
• and
• atomized, generally spherical magnet particles of a Ne—Fe—B alloy having a size distribution including a median particle size in the range of about 35-55 μm with a standard deviation in the range of about 10-30 μm and less than about 0.1% of the particles having a diameter above about 115 μm,
• wherein the magnet has a percent ultimate elongation greater than about 100%.

A permanent magnet comprising:

• about 13-30 vol. % nitrile rubber comprising about 23-37% acrylonitrile;
• about 2-5 vol. % ethylene vinyl acetate copolymer;
• about 3-10 vol. % precipitated amorphous silica;
• and
• about 58-74 vol. % atomized, generally spherical magnet particles of a Ne—Fe—B alloy having a size distribution including a median particle size in the range of about 35-55 μm with a standard deviation in the range of about 10-30 μm and less than about 0.1% of the particles having a diameter above about 115 μm,
• wherein the magnet has a percent ultimate elongation greater than about 100%.