Modulated exchange bias in NiFe/CoO/α-Fe2O3 trilayers and NiFe/CoO bilayers

X. Li; K. W. Lin; W. C. Yeh; R. D. Desautels; J. van Lierop; Philip W.T. Pong

doi:10.1016/j.physleta.2016.11.033

Modulated exchange bias in NiFe/CoO/α-Fe₂O₃ trilayers and NiFe/CoO bilayers

X. Li, K. W. Lin, W. C. Yeh, R. D. Desautels, J. van Lierop, Philip W.T. Pong

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

4 Scopus citations

Abstract

While the exchange bias in ferromagnetic/antiferromagnetic (FM/AF) bilayer and FM1/AF/FM2 trilayer configurations has been widely investigated, the role of an AF2 layer in FM/AF1/AF2 trilayer configurations is still not well understood. In this work, the magnetic properties of NiFe/CoO, NiFe/α-Fe₂O₃ bilayers, and NiFe/CoO/α-Fe₂O₃ trilayer were studied comparatively. The microstructure and chemical composition were characterized. Temperature dependent magnetometry reveals increased irreversibility temperature in NiFe/CoO/α-Fe₂O₃ trilayer compared with NiFe/CoO bilayer. The magnetic hysteresis loops show that the exchange bias (H_ex) and coercivity (H_c) depend strongly on the anisotropy of AF layer (CoO, α-Fe₂O₃ and CoO/α-Fe₂O₃). Our work shows that the AF1/AF2 interfacial interactions can be used effectively for tuning the exchange bias in FM/AF1/AF2 trilayers.

Original language	English (US)
Pages (from-to)	524-528
Number of pages	5
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	381
Issue number	5
DOIs	https://doi.org/10.1016/j.physleta.2016.11.033
State	Published - Feb 5 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Keywords

Exchange bias
Magnetic thin film
Nanomagnetics
Trilayer

Access to Document

10.1016/j.physleta.2016.11.033

Cite this

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title = "Modulated exchange bias in NiFe/CoO/α-Fe2O3 trilayers and NiFe/CoO bilayers",

abstract = "While the exchange bias in ferromagnetic/antiferromagnetic (FM/AF) bilayer and FM1/AF/FM2 trilayer configurations has been widely investigated, the role of an AF2 layer in FM/AF1/AF2 trilayer configurations is still not well understood. In this work, the magnetic properties of NiFe/CoO, NiFe/α-Fe2O3 bilayers, and NiFe/CoO/α-Fe2O3 trilayer were studied comparatively. The microstructure and chemical composition were characterized. Temperature dependent magnetometry reveals increased irreversibility temperature in NiFe/CoO/α-Fe2O3 trilayer compared with NiFe/CoO bilayer. The magnetic hysteresis loops show that the exchange bias (Hex) and coercivity (Hc) depend strongly on the anisotropy of AF layer (CoO, α-Fe2O3 and CoO/α-Fe2O3). Our work shows that the AF1/AF2 interfacial interactions can be used effectively for tuning the exchange bias in FM/AF1/AF2 trilayers.",

keywords = "Exchange bias, Magnetic thin film, Nanomagnetics, Trilayer",

author = "X. Li and Lin, {K. W.} and Yeh, {W. C.} and Desautels, {R. D.} and {van Lierop}, J. and Pong, {Philip W.T.}",

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T1 - Modulated exchange bias in NiFe/CoO/α-Fe2O3 trilayers and NiFe/CoO bilayers

AU - Li, X.

AU - Lin, K. W.

AU - Yeh, W. C.

AU - Desautels, R. D.

AU - van Lierop, J.

AU - Pong, Philip W.T.

PY - 2017/2/5

Y1 - 2017/2/5

N2 - While the exchange bias in ferromagnetic/antiferromagnetic (FM/AF) bilayer and FM1/AF/FM2 trilayer configurations has been widely investigated, the role of an AF2 layer in FM/AF1/AF2 trilayer configurations is still not well understood. In this work, the magnetic properties of NiFe/CoO, NiFe/α-Fe2O3 bilayers, and NiFe/CoO/α-Fe2O3 trilayer were studied comparatively. The microstructure and chemical composition were characterized. Temperature dependent magnetometry reveals increased irreversibility temperature in NiFe/CoO/α-Fe2O3 trilayer compared with NiFe/CoO bilayer. The magnetic hysteresis loops show that the exchange bias (Hex) and coercivity (Hc) depend strongly on the anisotropy of AF layer (CoO, α-Fe2O3 and CoO/α-Fe2O3). Our work shows that the AF1/AF2 interfacial interactions can be used effectively for tuning the exchange bias in FM/AF1/AF2 trilayers.

AB - While the exchange bias in ferromagnetic/antiferromagnetic (FM/AF) bilayer and FM1/AF/FM2 trilayer configurations has been widely investigated, the role of an AF2 layer in FM/AF1/AF2 trilayer configurations is still not well understood. In this work, the magnetic properties of NiFe/CoO, NiFe/α-Fe2O3 bilayers, and NiFe/CoO/α-Fe2O3 trilayer were studied comparatively. The microstructure and chemical composition were characterized. Temperature dependent magnetometry reveals increased irreversibility temperature in NiFe/CoO/α-Fe2O3 trilayer compared with NiFe/CoO bilayer. The magnetic hysteresis loops show that the exchange bias (Hex) and coercivity (Hc) depend strongly on the anisotropy of AF layer (CoO, α-Fe2O3 and CoO/α-Fe2O3). Our work shows that the AF1/AF2 interfacial interactions can be used effectively for tuning the exchange bias in FM/AF1/AF2 trilayers.

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