L10-FeNi magnetic powder and bond magnet
An L10-FeNi magnetic powder has an average particle size of 50 nm to 1 μm, and an average value of sphericity P of 0.9 or more. The sphericity P is defined as P=Ls/Lr, where Lr is a perimeter of an L10-FeNi magnetic powder particle on an image of a microscope, and Ls is a perimeter of a perfect circle that has a same area as the L10-FeNi magnetic powder particle on the image for which Lr is calculated.
1. A bonded magnet comprising:
a base material; and
a magnetic powder dispersed in the base material,
wherein the magnetic powder includes:
an L10-FeNi magnetic powder having:
an average particle size of 50 nm to 1 μm; and
an average value of sphericity P of 0.9 or more,
wherein the sphericity P is defined as P=Ls/Lr,
where Lr is a perimeter of an L10-FeNi magnetic powder particle on an image of a microscope, and Ls is a perimeter of a perfect circle that has a same area as the L10-FeNi magnetic powder particle on the image for which Lr is calculated; and
a large-size magnetic powder having a different composition from the L10-FeNi magnetic powder and having an average particle size of 1 μm to 500 μm,
wherein a mass percent of the L10-FeNi magnetic powder in the magnetic powder is 5% or more.
2. The bonded magnet according to claim 1 , the average particle size of the L10-FeNi magnetic powder being in a range from 400 nm to 1 μm.
3. The bonded magnet according to claim 1 , wherein:
a filling ratio of the magnetic powder is 80 mass % or more.
4. The bonded magnet according to claim 1 , wherein:
the mass percent of the L10-FeNi magnetic powder in the magnetic powder is 10% or more.