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説明:

This study examines the output characteristics and noise behavior of giant magnetoresistance (GMR) magnetic field sensors employing the pulse-width modulation domain wall displacement (PWM-DWD) method. In this approach, a high-frequency (up to 100 kHz) sinusoidal magnetic field is applied along the asy axis of the free-layer magnetization in the GMR device to induce oscillatory otion of domain walls, with the modulation amplitude exceeding the coercivity of the free layer. By periodically driving the domain walls close to magnetization saturation, hysteresis in the sensor output is effectively suppressed, thereby yielding a highly linear sensor response. The sensor demonstrated a minimum detectivity of 14 nT/Hz1/2 at 120 Hz under a modulation field of 1.1 mT at 100 kHz. The dominant noise source was identified as the stochastic nature of domain wall displacement, and further noise reduction is anticipated through lowering the coercivity of the free-layer material and increasing the modulation frequency.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Magnetic field sensors, Giant magnetoresistance, Pulse width modulation, Domain walls, Linearity, Noise

刊行年月日: 2026-03-26

出版者: Elsevier BV

掲載誌:

• Journal of Magnetism and Magnetic Materials (ISSN: 03048853) vol. 648 174050

研究助成金:

• Nagoya University JPMXP1224NU5222
• Ministry of Education, Culture, Sports, Science and Technology
• Japan Science and Technology Corporation JPMJTR24R7

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.jmmm.2026.174050

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更新時刻: 2026-10-16 11:32:50 +0900

MDRでの公開時刻: 2026-10-16 14:32:09 +0900