中国物理B ›› 2025, Vol. 34 ›› Issue (8): 88502-088502.doi: 10.1088/1674-1056/adce99

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

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)†   

  1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 收稿日期:2025-02-11 修回日期:2025-04-01 接受日期:2025-04-21 出版日期:2025-07-17 发布日期:2025-08-12
  • 通讯作者: Qingfang Liu E-mail:liuqf@lzu.edu.cn
  • 基金资助:
    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).

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

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)†   

  1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2025-02-11 Revised:2025-04-01 Accepted:2025-04-21 Online:2025-07-17 Published:2025-08-12
  • Contact: Qingfang Liu E-mail:liuqf@lzu.edu.cn
  • Supported by:
    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).

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摘要： 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.

关键词: exchange bias, surface acoustic wave, anisotropic magnetoresistance, thermal effect

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.

Key words: exchange bias, surface acoustic wave, anisotropic magnetoresistance, thermal effect

中图分类号:  (Magnetostrictive, magnetoacoustic, and magnetostatic devices)

  • 85.70.Ec
77.80.bn (Strain and interface effects) 75.30.Gw (Magnetic anisotropy)