Abstract: A method for preparing a NdFeB permanent magnetic material may include providing a covered NdFeB magnetic powder by depositing heavy rare earth particles or high-melting particles onto a NdFeB magnetic powder by physical vapor deposition; and performing orientation molding and sintering on the covered NdFeB magnetic powder to provide the NdFeB permanent magnetic material.

Abstract: The present invention relates to a magnetic-dielectric composite for a high-frequency antenna substrate, and a manufacturing method therefor, the composite comprising: a porous insulating dielectric substrate including an upper surface, a lower surface and lateral surfaces, and having a plurality of pores penetrating the upper surface and the lower surface; and soft ferrite nano-wires provided within the pores, wherein the soft ferrite nano-wires are encompassed by the insulating dielectric substrate so as to be separated from each other. The present invention controls a dielectric constant and can minimize eddy current loss by having a structure in which the soft ferrite nano-wires are provided within the pores of the insulating dielectric substrate and in which the soft ferrite nano-wires are encompassed by the insulating dielectric substrate so as to be separated from each other.

Abstract: A magnetic stack includes a substrate, a magnetic recording layer, and a TiN—X layer disposed between the substrate and the magnetic recording layer. In the TiN—X layer, X is a dopant comprising at least one of MgO, TiO, TiO2, ZrN, ZrO, ZrO2, HfN, HfO, AlN, and Al2O3.

Abstract: To suppress a magnetic wall movement in the structure including an amorphous magnetic layer as a recording layer, and to realize a high density recording with a sufficient signal quality level, a magnetic recording medium includes an amorphous magnetic layer (recording layer) formed on a substrate, a non-magnetic metal element layer (underlayer) formed between the substrate and the amorphous magnetic layer, wherein an average surface roughness Ra of the non-magnetic metal element layer is in a range of 0.7 nm to 2.0 nm. The foregoing structure having the non-magnetic metal element layer of a large average surface roughness Ra brings about a great pinning effect onto the amorphous magnetic layer, thereby forming magnetic bits under stable conditions when carrying out a high density recording.