HAMR media with a magnetic recording layer having a reduced Curie temperature and methods of fabricating the HAMR media are provided. One such HAMR medium includes a substrate, a heat sink layer on the substrate, an interlayer on the heat sink layer, and a multi-layer magnetic recording layer on the interlayer. In such case, the multi-layer magnetic recording layer includes a first magnetic recording layer including an alloy selected from FePtX and CoPtX, where X is a material selected from the group consisting of Cu, Ni, and combinations thereof, a second magnetic recording layer on the first magnetic recording layer and having at least one material different from the materials of the first magnetic recording layer, and a third magnetic recording layer on the second magnetic recording layer and having at least one material different from the materials of the first magnetic recording layer.

A method for manufacturing a magnetic core of an electric vehicle motor comprises: providing an electrical steel sheet and a release film; a heating step which heats the electrical steel sheet; an adhering step which adheres the release film to the heated electrical steel sheet; a removing step which removes the release film to leave the glue layer on the electrical steel sheet; a stacking step; a repeating step which repeats the heating step, the adhering step, the removing step and the stacking step to form a multi-layer structure having the electrical steel sheets and the glue layers interleaved stacked; and a solidifying step which heats the multi-layer structure to solidify the glue layers. Through the above steps, the thickness of the glue layer in the magnetic core would be uniform.

A method for manufacturing a magnetic core of an electric vehicle motor comprises: providing an electrical steel sheet and a release film; a heating step which heats the electrical steel sheet; an adhering step which adheres the release film to the heated electrical steel sheet; a removing step which removes the release film to leave the glue layer on the electrical steel sheet; a stacking step; a repeating step which repeats the heating step, the adhering step, the removing step and the stacking step to form a multi-layer structure having the electrical steel sheets and the glue layers interleaved stacked; and a solidifying step which heats the multi-layer structure to solidify the glue layers. Through the above steps, the thickness of the glue layer in the magnetic core would be uniform.

An excellent low noise property and excellent low iron loss property are obtained. A grain-oriented electrical steel sheet includes refined magnetic domains formed by electron beam irradiation. When the maximum magnetic flux density is 1.7 T, the grain-oriented electrical steel sheet has a residual magnetic flux density of 0.1 to 0.7 times the residual magnetic flux density before the electron beam irradiation and a maximum magnetizing force of 1.1 to 2.0 times the maximum magnetizing force before the electron beam irradiation.

An excellent low noise property and excellent low iron loss property are obtained. A grain-oriented electrical steel sheet includes refined magnetic domains formed by electron beam irradiation. When the maximum magnetic flux density is 1.7 T, the grain-oriented electrical steel sheet has a residual magnetic flux density of 0.1 to 0.7 times the residual magnetic flux density before the electron beam irradiation and a maximum magnetizing force of 1.1 to 2.0 times the maximum magnetizing force before the electron beam irradiation.

A method for manufacturing a magnetic core of an electric vehicle motor comprises: providing an electrical steel sheet and a release film; a heating step which heats the electrical steel sheet; an adhering step which adheres the release film to the heated electrical steel sheet; a removing step which removes the release film to leave the glue layer on the electrical steel sheet; a stacking step; a repeating step which repeats the heating step, the adhering step, the removing step and the stacking step to form a multi-layer structure having the electrical steel sheets and the glue layers interleaved stacked; and a solidifying step which heats the multi-layer structure to solidify the glue layers. Through the above steps, the thickness of the glue layer in the magnetic core would be uniform.

A method for manufacturing a magnetic core of an electric vehicle motor comprises: providing an electrical steel sheet and a release film; a heating step which heats the electrical steel sheet; an adhering step which adheres the release film to the heated electrical steel sheet; a removing step which removes the release film to leave the glue layer on the electrical steel sheet; a stacking step; a repeating step which repeats the heating step, the adhering step, the removing step and the stacking step to form a multi-layer structure having the electrical steel sheets and the glue layers interleaved stacked; and a solidifying step which heats the multi-layer structure to solidify the glue layers. Through the above steps, the thickness of the glue layer in the magnetic core would be uniform.

Methods of forming a layer of magnetic material on a substrate, the method including: configuring a substrate in a chamber; controlling the temperature of the substrate at a substrate temperature, the substrate temperature being at or below about 250 C.; and introducing one or more precursors into the chamber, the one or more precursors including: cobalt (Co), nickel (Ni), iron (Fe), or combinations thereof, wherein the precursors chemically decompose at the substrate temperature, and wherein a layer of magnetic material is formed on the substrate, the magnetic material including at least a portion of the one or more precursors, and the magnetic material having a magnetic flux density of at least about 1 Tesla (T).

Methods of forming a layer of magnetic material on a substrate, the method including: configuring a substrate in a chamber; controlling the temperature of the substrate at a substrate temperature, the substrate temperature being at or below about 250 C.; and introducing one or more precursors into the chamber, the one or more precursors including: cobalt (Co), nickel (Ni), iron (Fe), or combinations thereof, wherein the precursors chemically decompose at the substrate temperature, and wherein a layer of magnetic material is formed on the substrate, the magnetic material including at least a portion of the one or more precursors, and the magnetic material having a magnetic flux density of at least about 1 Tesla (T).

When a slurry 41 obtained by dispersing a rare-earth-compound powder in a solvent is applied to sintered magnet bodies 1, and dried to remove the solvent in the slurry and cause the surfaces of the sintered magnet bodies to be coated with the powder, and the sintered magnet bodies coated with the powder are heat treated to cause the rare-earth element to be absorbed by the sintered magnet bodies, the sintered magnet bodies having had the slurry applied thereto are dried by being irradiated with near infrared radiation having a wavelength of 0.8-5 m, to remove the solvent in the slurry, and cause the surfaces of the sintered magnet bodies to be coated with the powder. As a result, the rare-earth-compound powder can be uniformly and efficiently applied to the surfaces of the sintered magnet bodies.