Modulation of anisotropic magnetoresistance by anomalous hall signal and its application to real-time domain wall velocity measurement

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:513

Article

Bhatt, Ramesh Chandra^1,2  Cheng, Yo-Yu^1,2  Ye, Lin-Xiu^1,2  Hai, Ngo Trong³  Wu, Jong-Ching³  Wu, Te-ho^1,2 

[1] Natl Yunlin Univ Sci & Technol, Grad Sch Mat Sci, Touliu 640, Yunlin, Taiwan

[2] Natl Yunlin Univ Sci & Technol, Taiwan SPIN Res Ctr, Touliu 640, Yunlin, Taiwan

[3] Natl Changhua Univ Educ, Dept Phys, Changhua 500, Taiwan

关键词: Anisotropic magnetoresistance;    Anomalous Hall effect;    Domain wall velocity;    Modulation;   

DOI  :  10.1016/j.jmmm.2020.167120

来源: Elsevier

【 摘 要 】

We present here a way to modulate the anisotropic magnetoresistance (AMR) by anomalous Hall signal and thus measure the domain wall (DW) motion velocity at near-coercivity. We study the magnetization relaxation at the constant field in the longitudinal (R-xx) Hall geometry. We observed asymmetric R-xx peaks that appear at the DW pinning fields. This unusual magnetoresistance behavior is explained by considering the AMR modulation by the anomalous Hall voltage. In the proposed method, using the magnetization relaxation, the real-time DW velocity measurement is much easier in comparison to the other microscopy methods. Moreover, the additional signal from anomalous Hall voltage makes this technique simpler and sensitive for DW velocity measurements, which can be useful for various spintronic sensing applications.

【 授权许可】

Free