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Property of Giant Magnetoresistance-Spin Valve NiO/NiFe/Cu/NiFe Multilayer According to Width Variation and the Development of a Self-Driving Spin-Device
New Phys.: Sae Mulli 2019; 69: 889~894
Published online September 30, 2019;
© 2019 New Physics: Sae Mulli.

Jong-Gu CHOI1, Byeong-Uk KANG1, Sang-Suk LEE1*, Purevdorj KHAJIDMAA2, Woo-Il YANG3

1Department of Oriental Biomedical Engineering, Sangji University, Wonju 26339, Korea
2Department of Oriental-Western Biomedical Engineering, Graduation, Sangji University
3Department of Applied Physics and Electronics, Sangji University, Wonju 26339, Korea
Correspondence to:
Received July 23, 2019; Revised August 8, 2019; Accepted August 8, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The giant magnetoresistance-spin valve (GMR-SV) multilayer of NiFe/Cu/NiFe/Ta based on antiferromagnetic NiO was fabricated by using a sputtering deposition system. The thin multilayer with a width of the thin film passing through the 4-terminal was formed differently. The magnetic properties obtained from the major and the minor magnetoresistance curves measured at room temperature (RT) and at 77 K were investigated for thin films with four different widths. The exchange coupling field (H$ _{\text{ex}}$), the coercivity (H$ _{\text{c}}$), and the magnetoresistance ratio (MR) of the NiO GMR-SV multilayer with a 4 mm width were 30 Oe, 35 Oe, and 3.3% at room temperature and 190 Oe, 200 Oe, and 7.3% at 77 K. The value of H$ _{\text{ex}}$ and H$ _{\text{c}}$ for the NiFe free layer were constant at RT and 77 K, as the width of the multilayer decreased to 0.5 mm, and the MR ratio decreased linearly to 2.9% at RT and 6.4% at 77 k. Based on these properties, we proposed a self-driving spin-device(2SD) that can be developed as a hybrid-type multilayer composed of high-Tc superconductor YBCO film and NiO spin valve film.
PACS numbers: 74.78.-w, 75.47.De, 75.70.-i
Keywords: Spin valve, Liquid nitrogen, Width, Free layer, Coercivity, Self-driving

September 2019, 69 (9)
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