Role of TbFe on perpendicular magnetic anisotropy and giant magnetoresistance effect in [Co/Ni]N-based spin valves

Minghong Tang; Zongzhi Zhang; Yanyan Zhu; Bin Ma; Qinyuan Jin

doi:10.1007/s40820-014-0009-1

Role of TbFe on perpendicular magnetic anisotropy and giant magnetoresistance effect in [Co/Ni]_N-based spin valves

Minghong Tang, Zongzhi Zhang, Yanyan Zhu, Bin Ma, Qinyuan Jin

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The exchange-coupled [Co/Ni]_N/TbFe nano-magnetic films can display strong perpendicular magnetic anisotropy (PMA) which depends on the Tb:Fe component ratio, TbFe layer thickness and the repetition number N of [Co/ Ni]_N multilayer. Perpendicular spin valves in the nano thickness scale, consisting of a [Co/Ni]3 free and a [Co/Ni]5/TbFe reference multilayer, show high giant magnetoresistance (GMR) signal of 6.5 % and a large switching field difference over 3 kOe. However, unexpected slanting of the free layer magnetization, accompanied by a reduced GMR ratio, was found to be caused by the presence of a thick Fe-rich or even a thin but Tb-rich TbFe layer. We attribute this phenomenon to the large magnetostriction effect of TbFe which probably induces strong stress acting on the free layer and hence reduces its interfacial PMA.

Original language	English (US)
Pages (from-to)	359-364
Number of pages	6
Journal	Nano-Micro Letters
Volume	6
Issue number	4
DOIs	https://doi.org/10.1007/s40820-014-0009-1
State	Published - Oct 2014
Externally published	Yes

Bibliographical note

Publisher Copyright:
©The Author(s) 2014.

Keywords

Nano magnetic films
Perpendicular magnetic anisotropy
Spin valves
TbFe

Publisher link

10.1007/s40820-014-0009-1

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title = "Role of TbFe on perpendicular magnetic anisotropy and giant magnetoresistance effect in [Co/Ni]N-based spin valves",

abstract = "The exchange-coupled [Co/Ni]N/TbFe nano-magnetic films can display strong perpendicular magnetic anisotropy (PMA) which depends on the Tb:Fe component ratio, TbFe layer thickness and the repetition number N of [Co/ Ni]N multilayer. Perpendicular spin valves in the nano thickness scale, consisting of a [Co/Ni]3 free and a [Co/Ni]5/TbFe reference multilayer, show high giant magnetoresistance (GMR) signal of 6.5 % and a large switching field difference over 3 kOe. However, unexpected slanting of the free layer magnetization, accompanied by a reduced GMR ratio, was found to be caused by the presence of a thick Fe-rich or even a thin but Tb-rich TbFe layer. We attribute this phenomenon to the large magnetostriction effect of TbFe which probably induces strong stress acting on the free layer and hence reduces its interfacial PMA.",

keywords = "Nano magnetic films, Perpendicular magnetic anisotropy, Spin valves, TbFe",

author = "Minghong Tang and Zongzhi Zhang and Yanyan Zhu and Bin Ma and Qinyuan Jin",

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TY - JOUR

T1 - Role of TbFe on perpendicular magnetic anisotropy and giant magnetoresistance effect in [Co/Ni]N-based spin valves

AU - Tang, Minghong

AU - Zhang, Zongzhi

AU - Zhu, Yanyan

AU - Ma, Bin

AU - Jin, Qinyuan

N1 - Publisher Copyright: ©The Author(s) 2014.

PY - 2014/10

Y1 - 2014/10

N2 - The exchange-coupled [Co/Ni]N/TbFe nano-magnetic films can display strong perpendicular magnetic anisotropy (PMA) which depends on the Tb:Fe component ratio, TbFe layer thickness and the repetition number N of [Co/ Ni]N multilayer. Perpendicular spin valves in the nano thickness scale, consisting of a [Co/Ni]3 free and a [Co/Ni]5/TbFe reference multilayer, show high giant magnetoresistance (GMR) signal of 6.5 % and a large switching field difference over 3 kOe. However, unexpected slanting of the free layer magnetization, accompanied by a reduced GMR ratio, was found to be caused by the presence of a thick Fe-rich or even a thin but Tb-rich TbFe layer. We attribute this phenomenon to the large magnetostriction effect of TbFe which probably induces strong stress acting on the free layer and hence reduces its interfacial PMA.

AB - The exchange-coupled [Co/Ni]N/TbFe nano-magnetic films can display strong perpendicular magnetic anisotropy (PMA) which depends on the Tb:Fe component ratio, TbFe layer thickness and the repetition number N of [Co/ Ni]N multilayer. Perpendicular spin valves in the nano thickness scale, consisting of a [Co/Ni]3 free and a [Co/Ni]5/TbFe reference multilayer, show high giant magnetoresistance (GMR) signal of 6.5 % and a large switching field difference over 3 kOe. However, unexpected slanting of the free layer magnetization, accompanied by a reduced GMR ratio, was found to be caused by the presence of a thick Fe-rich or even a thin but Tb-rich TbFe layer. We attribute this phenomenon to the large magnetostriction effect of TbFe which probably induces strong stress acting on the free layer and hence reduces its interfacial PMA.

KW - Nano magnetic films

KW - Perpendicular magnetic anisotropy

KW - Spin valves

KW - TbFe

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