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Giant Magnetoresistive Property of a Superconductor Nb layer and a Spin-Valve NiFe/CoFe/Cu/CoFe/IrMn Multilayer Film
New Physics: Sae Mulli 2017; 67: 1035~1041
Published online September 29, 2017;
© 2017 New Physics: Sae Mulli.

Woo-Il YANG1, Jong-Gu CHOI2, Sang-Suk LEE*2

1 Department of Applied Physics and Electronics, Sangji University, Wonju 26339, Korea
2 Department of Oriental Biomedical Engineering, Sangji University, Wonju 26339, Korea
Correspondence to:
Received July 20, 2017; Revised July 30, 2017; Accepted July 30, 2017.
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.
A hybrid film with a superconductor Nb (20 nm) layer and a giant magnetoresistance-spin valve (GMR-SV) NiFe (10 nm)/CoFe (4 nm)/Cu (2.5 m)/CoFe (6 nm)/IrMn (10 nm)/Ta (5 nm) multilayer were prepared on Corning glass by using ion beam deposition and dc magnetron sputtering. The exchange-biased coupling field ($H_{ex}$) and the magnetoresistance (MR) ratio of a hybrid-type GMR-SV film with a Nb buffer layer were above of 185 Oe and 5%, respectively. We suggest that GMR ratio, depending on the magnetization spin array of the pinned and the free layers, can show a very high negative value on the basis of the proximity effect at the interface between the ferromagnetic metal and the Nb superconductor. 
PACS numbers: 73.21.Ac, 75.70.-i, 74.45.+c, 85.75.Ss, 85.70.Kh
Keywords: Giant magnetoresistance (GMR), Hybrid, Proximity effect, Critical temperature, Exchange biased coupling field

September 2017, 67 (9)