Annealing influence on magnetic anisotropies of CoFe thin films

Weihua Zhu; Guanjie Wu; Hongwei Xue; Zhendong Zhu; Q. Y. Jin; Zongzhi Zhang

doi:10.1063/1.5079760

Annealing influence on magnetic anisotropies of CoFe thin films

Weihua Zhu
, Guanjie Wu
, Hongwei Xue
, Zhendong Zhu
, Q. Y. Jin
, Zongzhi Zhang

Fudan University

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

3 Scopus citations

Abstract

Post-annealing effect on the magnetic anisotropies of cubic CoFe films epitaxially grown on MgO (001) substrates are investigated. X-ray diffraction patterns reveal that the crystallization degree gradually improves with the increase of annealing temperature (T_a), which results in obvious enhancement in both the uniaxial (H_U) and biaxial magnetic anisotropy fields. Magnetic hysteresis loops of the unannealed sample show two equivalent easy axes along the CoFe [110] and [110] directions, being in accord with the observed fourfold symmetry of angular remanent magnetization (ARM) curve. Nevertheless, with the increase of T_a, the two easy axis loops become inequivalent due to the increased H_U along [110] direction, thus giving rise to a two-step switching behavior for the [110] direction loop at T_a>350°C and the ARM curve transformation from fourfold to twofold symmetry. This work provides a deep insight and an effective approach to control the magnetic anisotropies and magnetization states for practical applications.

Original language	English
Article number	035305
Journal	AIP Advances
Volume	9
Issue number	3
DOIs	https://doi.org/10.1063/1.5079760
State	Published - 1 Mar 2019
Externally published	Yes

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title = "Annealing influence on magnetic anisotropies of CoFe thin films",

abstract = "Post-annealing effect on the magnetic anisotropies of cubic CoFe films epitaxially grown on MgO (001) substrates are investigated. X-ray diffraction patterns reveal that the crystallization degree gradually improves with the increase of annealing temperature (Ta), which results in obvious enhancement in both the uniaxial (HU) and biaxial magnetic anisotropy fields. Magnetic hysteresis loops of the unannealed sample show two equivalent easy axes along the CoFe [110] and [110] directions, being in accord with the observed fourfold symmetry of angular remanent magnetization (ARM) curve. Nevertheless, with the increase of Ta, the two easy axis loops become inequivalent due to the increased HU along [110] direction, thus giving rise to a two-step switching behavior for the [110] direction loop at Ta>350°C and the ARM curve transformation from fourfold to twofold symmetry. This work provides a deep insight and an effective approach to control the magnetic anisotropies and magnetization states for practical applications.",

author = "Weihua Zhu and Guanjie Wu and Hongwei Xue and Zhendong Zhu and Jin, \{Q. Y.\} and Zongzhi Zhang",

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doi = "10.1063/1.5079760",

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TY - JOUR

T1 - Annealing influence on magnetic anisotropies of CoFe thin films

AU - Zhu, Weihua

AU - Wu, Guanjie

AU - Xue, Hongwei

AU - Zhu, Zhendong

AU - Jin, Q. Y.

AU - Zhang, Zongzhi

PY - 2019/3/1

Y1 - 2019/3/1

N2 - Post-annealing effect on the magnetic anisotropies of cubic CoFe films epitaxially grown on MgO (001) substrates are investigated. X-ray diffraction patterns reveal that the crystallization degree gradually improves with the increase of annealing temperature (Ta), which results in obvious enhancement in both the uniaxial (HU) and biaxial magnetic anisotropy fields. Magnetic hysteresis loops of the unannealed sample show two equivalent easy axes along the CoFe [110] and [110] directions, being in accord with the observed fourfold symmetry of angular remanent magnetization (ARM) curve. Nevertheless, with the increase of Ta, the two easy axis loops become inequivalent due to the increased HU along [110] direction, thus giving rise to a two-step switching behavior for the [110] direction loop at Ta>350°C and the ARM curve transformation from fourfold to twofold symmetry. This work provides a deep insight and an effective approach to control the magnetic anisotropies and magnetization states for practical applications.

AB - Post-annealing effect on the magnetic anisotropies of cubic CoFe films epitaxially grown on MgO (001) substrates are investigated. X-ray diffraction patterns reveal that the crystallization degree gradually improves with the increase of annealing temperature (Ta), which results in obvious enhancement in both the uniaxial (HU) and biaxial magnetic anisotropy fields. Magnetic hysteresis loops of the unannealed sample show two equivalent easy axes along the CoFe [110] and [110] directions, being in accord with the observed fourfold symmetry of angular remanent magnetization (ARM) curve. Nevertheless, with the increase of Ta, the two easy axis loops become inequivalent due to the increased HU along [110] direction, thus giving rise to a two-step switching behavior for the [110] direction loop at Ta>350°C and the ARM curve transformation from fourfold to twofold symmetry. This work provides a deep insight and an effective approach to control the magnetic anisotropies and magnetization states for practical applications.

UR - https://www.scopus.com/pages/publications/85062870068

U2 - 10.1063/1.5079760

DO - 10.1063/1.5079760

M3 - 文章

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SN - 2158-3226

VL - 9

JO - AIP Advances

JF - AIP Advances

IS - 3

M1 - 035305

ER -

Annealing influence on magnetic anisotropies of CoFe thin films

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