Modulation of exchange bias in Py/IrMn films by surface acoustic waves

doi:10.1088/1674-1056/adce99

Abstract We investigate the surface acoustic wave (SAW) modulation of the exchange bias field ($H_{\rm EB}$) in Py/IrMn films deposited on LiNbO$_{3}$ substrates. We measured the anisotropic magnetoresistance (AMR) of the multilayer film when continuous SAW or pulsed SAW were applied and obtained $H_{\rm EB}$. With continuous SAW, the $H_{\rm EB}$ decreases continuously with power. While in the case of pulsed SAW, the $H_{\rm EB}$ first decreases and then stabilizes. Compared to pulsed SAW, the thermal effects from the continuous SAW lead to the continuous decrease of $H_{\rm EB}$ at higher SAW power, which is verified by the measurement of $H_{\rm EB}$ at different temperatures and input currents. Furthermore, our results show that pulsed SAW can effectively avoid thermal effects. The decrease of $H_{\rm EB}$ at smaller power in both continuous and pulsed SAW is mainly due to the SAW-induced dynamic strain field, which leads to a small perturbation in the magnetic moment of the FM layer. Combined with the AMR values measured at different angles during the saturation field, we believe that the SAW-induced dynamic strain field causes a 15$^\circ$ angle between the magnetic moment and the easy axis. Our experiments provide a different approach to manipulating $H_{\rm EB}$, opening up a potential avenue for future manipulation of antiferromagnetic moments.

Keywords: exchange bias surface acoustic wave anisotropic magnetoresistance thermal effect

Received: 11 February 2025
Revised: 01 April 2025
Accepted manuscript online: 21 April 2025

PACS:	85.70.Ec	(Magnetostrictive, magnetoacoustic, and magnetostatic devices)
	77.80.bn	(Strain and interface effects)
	75.30.Gw	(Magnetic anisotropy)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12174166 and 12304144), the Fund from Beijing National Laboratory for Condensed Matter Physics (Grant No. 2024BNLCMPKF013), and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2024-22).

Corresponding Authors: Qingfang Liu
E-mail: liuqf@lzu.edu.cn

Cite this article:

Jie Dong(董洁), Shuai Mi(米帅), Meihong Liu(刘美宏), Huiliang Wu(吴辉亮), Jinxuan Shi(石金暄), Huifang Qiao(乔慧芳), Qian Zhao(赵乾), Teng-Fei Zhang(张腾飞), Chenbo Zhao(赵晨博), Jianbo Wang(王建波), and Qingfang Liu(刘青芳) Modulation of exchange bias in Py/IrMn films by surface acoustic waves 2025 Chin. Phys. B 34 088502

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Modulation of exchange bias in Py/IrMn films by surface acoustic waves

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