Bi-synthesizing inverse iron magnetic structure film material

Abstract

The invention relates to a double compound antiferromagnetic structure film material, belonging to a functional material field. The invention is applied to a spin valve and is used as a basic part of a high density reading-out magnetic-head, a magnetic random access memory, a high sensitive sensor, and other spin electronic components. The invention is characterized in that the material comprises six metal films of a precious metal seed layer, a ferromagnetic metal layer, and a ruthenium layer, etc.; a bottom layer of the metal multi-layer film is the precious tantalum and copper with a thickness of 1 to 10 nanometers; a second layer above the bottom is a cobalt, cobalt-iron alloy and ferronickel alloy ferromagnetic metal layer with a thickness of 0.5 to 10 nanometers; the third layer is the ruthenium layer with a thickness of 0.1 to 1.2 nanometers; the fourth layer is the cobalt, cobalt-iron alloy and ferronickel alloy ferromagnetic metal layer with a thickness of 0.5 to 10 nanometers; the fifth layer is the ruthenium layer with a thickness of 0.1 to 1.2 nanometers; and the sixth layer is the cobalt, cobalt-iron alloy and ferronickel alloy ferromagnetic metal layer with a thickness of 0.5 to 10 nanometers. Compared with an SyAF structure, the invention is provided with lower saturation magnetization strength, a higher saturation field, lower coercive force and better heating stability.

Description

technical field [0001] The invention belongs to the field of functional materials, and provides a double-synthesized antiferromagnetic structure thin film material, which will be widely used in spin valves for high-density readout heads, magnetic random access memories, high-sensitivity sensor devices, etc. The device lays the foundation. Background technique [0002] In today's information age, information storage technology is crucial, and the explosive growth of information volume requires a rapid increase in the density of information storage. The areal density of hard disks is increasing at a rate of 200% per year, so the output of the magnetic head elements is also required to be higher and higher. The read head that is widely used in computer hard disks is a current parallel planar spin valve (CIP-SPV) metal multilayer film device. The common SPV structure of this ferromagnetic layer / isolation layer / ferromagnetic layer / antiferromagnetic layer , because the demagneti...