Influence of temperature on thermal relaxation of exchange bias field in CoFe/Cu/CoFe/IrMn spin valve

doi:10.1088/1674-1056/abec34

Abstract A multilayered spin valve film with a structure of Ta (5 nm)/Co₇₅Fe₂₅(5 nm)/Cu(2.5 nm)/Co₇₅Fe₂₅(5 nm)/Ir₂₀Mn₈₀ (12 nm)/Ta(8 nm) is prepared by the high-vacuum direct current (DC) magnetron sputtering. The effect of temperature on the spin valve structure and the magnetic properties are studied by x-ray diffraction (XRD), atomic force microscopy (AFM), and vibrating sample magnetometry. The effect of temperature on the exchange bias field thermomagnetic properties of multilayered spin valve is studied by the residence time of samples in a reverse saturation field. The results show that as the temperature increases, the IrMn (111) texture weakens, surface/interface roughness increases, and the exchange bias field decreases. Below 200 ℃, the exchange bias field decreases with the residence time increasing, and at the beginning of the negative saturation field, the exchange bias field H_ex decreases first quickly and then slowly gradually. When the temperature is greater than 200 ℃, the exchange bias field is unchanged with the residence time increasing.

Keywords: exchange bias field spin valves temperature thermal relaxation

Received: 10 January 2021
Revised: 24 February 2021
Accepted manuscript online: 05 March 2021

PACS:	75.60.Jk	(Magnetization reversal mechanisms)
	75.60.Nt	(Magnetic annealing and temperature-hysteresis effects)
	76.60.Es	(Relaxation effects)

Fund: Project supported by the Yunnan Provincial Ten Thousand Talents Plan Young Talents Training Fund, China (Grant No. KKRD201952029), the Applied Basic Research Program of Yunnan Province, China (Grant No. 2011FB037), and the School Talent Cultivation Foundation, China (Grant No. KKSY201252017).

Corresponding Authors: Xian-Jin Qi
E-mail: qixianjin79@163.com

Cite this article:

Xian-Jin Qi(祁先进), Ni-Na Yang(杨妮娜), Xiao-Xu Duan(段孝旭), and Xue-Zhu Li(李雪竹) Influence of temperature on thermal relaxation of exchange bias field in CoFe/Cu/CoFe/IrMn spin valve 2021 Chin. Phys. B 30 107501

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Influence of temperature on thermal relaxation of exchange bias field in CoFe/Cu/CoFe/IrMn spin valve

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