Patent ID: 8247093
Filing Date: 2012-08-21
Classification: B82Y,G01R,G11C,H01F,H01L,Y10T

Abstract:
1. A magnetic multilayer device comprising, on a substrate, an alternating sequence of magnetic metallic layers M and oxide, hydride or nitride layers O, wherein: the number of layer M equals at least two; the layers M are continuous, have a thickness ranging between 0.3 and 5 nm, and, in the absence of an applied magnetic field, have their magnetization parallel to the plane of the layer in the absence of layers O because of shape anisotropy; in a temperature range equal to or larger than ambient temperature, there occurs interfacial magnetic anisotropy perpendicular to the plane of the layers at the M/O and O/M interfaces, able to surpass the shape anisotropy and orient the magnetization axis of layers M in a direction substantially perpendicular to the plane of the layers in the absence of any external magnetic field; the magnetic metallic layers consist of a magnetic element, a magnetic alloy or a multilayer formed by an alternating sequence of non-magnetic and magnetic materials, the latter being selected from the group consisting of Fe, Ni, Co or alloys thereof; and the oxide, hydride or nitride layers O have a thickness of at least 0.3 nm and are based on elements selected from the group consisting of Al, Mg, Ru, Ta, Cr, Zr, Hf, Ti, V, Si, Cu, W or alloys thereof.