Perpendicular magnetic anisotropy BCC multilayers

Patent metadata

Field	Value
Publication number	US-9484531-B2
Application number	US-201514744137-A
Country	US
Kind code	B2
Filing date	Jun 19, 2015
Priority date	Mar 26, 2015
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A magnetic material includes a cobalt layer between opposing iron layers. The iron layers include iron and are body-centered cubic (BCC), the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a perpendicular magnetic anisotropy (PMA).

First claim

What is claimed is:

1. A method of making a magnetic material, the method comprising:
forming a cobalt layer on a first iron layer; and
forming a second iron layer on the cobalt layer; and
forming an iron-rich dusting layer and a tunnel barrier layer on the first or second iron layers, the tunnel barrier layer formed on the iron-rich dusting layer;
wherein the first and second iron layers comprise iron and are BCC, the cobalt layer comprises cobalt and is BCC or amorphous, and the magnetic material has a PMA.

2. The method of claim 1 , wherein the tunnel barrier layer comprises magnesium oxide.

Assignees

• IBM

Inventors

• Hu Guohan
• Worledge Daniel C

Classifications

• H01F10/16

  containing cobalt ({H01F10/126} , H01F10/13 take precedence) · CPC title

• H01F41/32

  for applying conductive, insulating or magnetic material on a magnetic film {, specially adapted for a thin magnetic film} · CPC title

• H01F10/14

  containing iron or nickel ({H01F10/126} , H01F10/13, H01F10/16 take precedence) · CPC title

• H01F10/3286 Primary

  Spin-exchange coupled multilayers having at least one layer with perpendicular magnetic anisotropy · CPC title

• H01F10/3254

  the spacer being semiconducting or insulating, e.g. for spin tunnel junction [STJ] · CPC title