Patent ID: 9704512
Date: 2017-07-11
CPC Classifications: B82Y,G11B,H01F

Claim:
1. A write head device for an electromagnetic data storage device which includes a data storage medium including a magnetic material, wherein the write head device comprises a write head operable to generate a magnetic field that impinges on a selected portion of the magnetic material of the data storage medium adjacent the write head, so as to affect the magnetization direction of the selected portion of the magnetic material, the write head comprising: a magnetic structure including a matrix material and a plurality of magnetic nanoparticles held in the matrix material; and an activation element operable to induce the magnetic field in the magnetic structure, wherein each of the plurality of magnetic nanoparticles comprises a core wholly or substantially covered with a shell layer separate from the matrix material, wherein at least one of the matrix material and the core is of ferromagnetic material, wherein the shell layer is of a different material than the core, and wherein the shell layer of the plurality of magnetic nanoparticles substantially prevent contact between the cores of adjacent nanoparticles.