Effect of thermal deformation on giant magnetoresistance of flexible spin valves grown on polyvinylidene fluoride membranes

doi:10.1088/1674-1056/25/7/077307

Abstract

We fabricated flexible spin valves on polyvinylidene fluoride (PVDF) membranes and investigated the influence of thermal deformation of substrates on the giant magnetoresistance (GMR) behaviors. The large magnetostrictive Fe₈₁Ga₁₉ (FeGa) alloy and the low magnetostrictive Fe₁₉Ni₈₁ (FeNi) alloy were selected as the free and pinned ferromagnetic layers. In addition, the exchange bias (EB) of the pinned layer was set along the different thermal deformation axes α₃₁ or α₃₂ of PVDF. The GMR ratio of the reference spin valves grown on Si intrinsically increases with lowering temperature due to an enhancement of spontaneous magnetization. For flexible spin valves, when decreasing temperature, the anisotropic thermal deformation of PVDF produces a uniaxial anisotropy along the α₃₂ direction, which changes the distribution of magnetic domains. As a result, the GMR ratio at low temperature for spin valves with EB||α₃₂ becomes close to that on Si, but for spin valves with EB||α₃₁ is far away from that on Si. This thermal effect on GMR behaviors is more significant when using magnetostrictive FeGa as the free layer.

Keywords: giant magnetoresistance flexible spin-valves thermal expansion

Received: 25 February 2016
Revised: 21 March 2016
Accepted manuscript online:

PACS:	73.43.Qt	(Magnetoresistance)
	75.30.Gw	(Magnetic anisotropy)
	75.70.-i	(Magnetic properties of thin films, surfaces, and interfaces)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11374312, 51401230, 51522105, and 51471101 ) and the Ningbo Science and Technology Innovation Team, China (Grant No. 2015B11001).

Corresponding Authors: Qingfeng Zhan, Yali Xie, Xiaohua Tan
E-mail: zhanqf@nimte.ac.cn;tanxiaohua123@shu.edu.cn;runweili@nimte.ac.cn

Cite this article:

Luping Liu(刘鲁萍), Qingfeng Zhan(詹清峰), Xin Rong(荣欣), Huali Yang(杨华礼), Yali Xie(谢亚丽), Xiaohua Tan(谭晓华), Run-wei Li(李润伟) Effect of thermal deformation on giant magnetoresistance of flexible spin valves grown on polyvinylidene fluoride membranes 2016 Chin. Phys. B 25 077307

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Effect of thermal deformation on giant magnetoresistance of flexible spin valves grown on polyvinylidene fluoride membranes

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