Co/Cu/Co Pseudo Spin-Valve System Prepared by Magnetron Sputtering with Different Argon Pressure

Abstract

Thin Co films were fabricated by DC magnetron sputtering. The effect of argon pressure on the microstructure, surface morphology and magnetic properties of the samples was systematically studied. It was found that with the increase of argon pressure, the sharpness of the crystalline texture of the samples declines, the roughness of film surfaces and the coercivity of the films increase. Based on these results, a Co/Cu/Co pseudo spin-valve system was designed and the corresponding structures were fabricated. The difference in coercivity of magnetic layers was obtained by deposition of the Co layers at different Ar pressures. Change of the resistance of this trilayer is induced at a moderate field by the spin rotation in the soft layer with lower coercivity.

A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge

“…If dipolar ferromagnetic interactions are dominant, then H j and MR max decrease with an increase in spacer thickness. If the standard deviation of the interlayer roughness is no more than 0.3–0.5 nm [ 10 , 11 ], then the RKKY interactions can be dominant. In this case, H j changes periodically with an increase in the spacer thickness, enabling an SV with H j ≈ 0 and a large MR max to be obtained [ 12 ].…”

“…A thermomagnetic treatment mode to form an opposite exchange shift in the nonparallel sides of a rhombus-shaped micro-object was found, and the full Wheatstone bridge circuit was realized. (10)/Ta(5) were deposited on glass substrates via dc magnetron sputtering in a magnetic field of 80 Oe and applied in a film plane. Layer thicknesses are given in nm.…”

Spin Valve-Based Rhombus-Shaped Microobject Implementing Full Wheatstone Bridge

“…If dipolar ferromagnetic interactions are dominant, then H j and MR max decrease with an increase in spacer thickness. If the standard deviation of the interlayer roughness is no more than 0.3-0.5 nm [10,11], then the RKKY interactions can be dominant. In this case, Hj changes periodically with an increase in the spacer thickness, enabling an SV with Hj ≈ 0 and a large MR max to be obtained [12].…”