Planar Patterned Magnetic Media Obtained by Ion Irradiation

Abstract

By ion irradiation through a lithographically made resist mask, the magnetic properties of cobalt-platinum simple sandwiches and multilayers were patterned without affecting their roughness and optical properties. This was demonstrated on arrays of 1-micrometer lines by near- and far-field magnetooptical microscopy. The coercive force and magnetic anisotropy of the irradiated regions can be accurately controlled by the irradiation fluence. If combined with high-resolution lithography, this technique holds promise for ultrahigh-density magnetic recording applications.

Temperature-dependent magnetization reversal in(Co∕Pt)∕Rumultilayers

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The magnetization reversal process in these systems usually involves the formation of vertically correlated stripe domains, through the entire multilayer film stack resulting from a competition between ferromagnetic (FM) exchange, anisotropy and dipolar energies. 1 The energy balance can be further tailored through the addition of Ru spacer layers with appropriate thicknesses, which establishes antiferromagnetic (AF) interlayer exchange coupling.…”

Self-assembled ferrite nanodots on multifunctional Au nanoparticles

“…SrFe 12 O 19 also shows sufficient chemical stability, corrosion resistance, and superior wear resistance; these characteristics make SrFe 12 O 19 suitable for use in functional magnetic nanoparticles. The combined feature of superior wear resistance and a high K 1 value is one of the important factors in the fabrication of magnetic nanostructures.…”

“…The combined feature of superior wear resistance and a high K 1 value is one of the important factors in the fabrication of magnetic nanostructures. Sufficient magnetic properties can be expected, even after nanofabrication of SrFe 12 O 19 , due to the large K 1 value, while the wear resistance easily enables fabrication of SrFe 12 O 19 at the nanoscale. In spite of these advantages, there are only a few reports on the processing of hexagonal ferrites that are ten to several tens of nanometers in size.…”

“…In spite of these advantages, there are only a few reports on the processing of hexagonal ferrites that are ten to several tens of nanometers in size. Therefore, it is worth studying the fabrication of SrFe 12 O 19 on the several tens of nanometers or slightly larger scale to investigate its potential in future applications such as functional magnetic nanodevices.…”

“…A wide variety of techniques have been reported for the preparation of magnetic nanostructures, such as imprint lithography [9][10][11], ion irradiation [12,13], focused ion beam lithography [14,15], electron beam lithography [6,16,17], and a combination of lithographic techniques and electrochemical deposition of magnetic materials [17]. However, structural and magnetic damage are unavoidable issues in lithography.…”