Exchange bias in ferromagnetic bilayers with orthogonal anisotropies: the case of GaMnAsP/GaMnAs combination

Suho Choi; Seul Ki Bac; Xinyu Liu; Sanghoon Lee; Sining Dong; M. Dobrowolska; J. K. Furdyna

doi:10.1038/s41598-019-49492-4

Exchange bias in ferromagnetic bilayers with orthogonal anisotropies: the case of GaMnAsP/GaMnAs combination

Suho Choi, Seul Ki Bac, Xinyu Liu, Sanghoon Lee, Sining Dong, M. Dobrowolska, J. K. Furdyna

Department of Physics

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

7 Citations (Scopus)

Abstract

We report the observation of exchange bias in a ferromagnetic Ga_0.94Mn_0.06As_0.77P_0.23/ Ga_0.94Mn_0.06As bilayer, in which the easy axis in one layer is oriented out-of-plane, and in the other in-plane. Magnetization reversal in this system is explored using planar Hall effect (PHE) measurements under various initial conditions and with various field-cooling orientations. Our results show that the two magnetic layers are ferromagnetically exchange-coupled, and that such coupling results in pronounced exchange-bias-like shifts of magnetic hysteresis loops during reversal of in-plane magnetization. The presence of exchange bias in this system can be understood on the basis of magnetic closure domains formed in the layer with the out-of-plane easy axis.

Original language	English
Article number	13061
Journal	Scientific reports
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41598-019-49492-4
Publication status	Published - 2019 Dec 1

Bibliographical note

Funding Information:
This work is supported by the NSF Grant DMR14-00432; by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1D1A1A02042965); by Ministry of Science ICT (2018R1A4A1024157); and by a Korea University Future Research Grant.

Publisher Copyright:
© 2019, The Author(s).

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title = "Exchange bias in ferromagnetic bilayers with orthogonal anisotropies: the case of GaMnAsP/GaMnAs combination",

abstract = "We report the observation of exchange bias in a ferromagnetic Ga0.94Mn0.06As0.77P0.23/ Ga0.94Mn0.06As bilayer, in which the easy axis in one layer is oriented out-of-plane, and in the other in-plane. Magnetization reversal in this system is explored using planar Hall effect (PHE) measurements under various initial conditions and with various field-cooling orientations. Our results show that the two magnetic layers are ferromagnetically exchange-coupled, and that such coupling results in pronounced exchange-bias-like shifts of magnetic hysteresis loops during reversal of in-plane magnetization. The presence of exchange bias in this system can be understood on the basis of magnetic closure domains formed in the layer with the out-of-plane easy axis.",

author = "Suho Choi and Bac, {Seul Ki} and Xinyu Liu and Sanghoon Lee and Sining Dong and M. Dobrowolska and Furdyna, {J. K.}",

note = "Funding Information: This work is supported by the NSF Grant DMR14-00432; by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1D1A1A02042965); by Ministry of Science ICT (2018R1A4A1024157); and by a Korea University Future Research Grant. Publisher Copyright: {\textcopyright} 2019, The Author(s).",

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T1 - Exchange bias in ferromagnetic bilayers with orthogonal anisotropies

T2 - the case of GaMnAsP/GaMnAs combination

AU - Choi, Suho

AU - Bac, Seul Ki

AU - Liu, Xinyu

AU - Lee, Sanghoon

AU - Dong, Sining

AU - Dobrowolska, M.

AU - Furdyna, J. K.

N1 - Funding Information: This work is supported by the NSF Grant DMR14-00432; by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1D1A1A02042965); by Ministry of Science ICT (2018R1A4A1024157); and by a Korea University Future Research Grant. Publisher Copyright: © 2019, The Author(s).

PY - 2019/12/1

Y1 - 2019/12/1

N2 - We report the observation of exchange bias in a ferromagnetic Ga0.94Mn0.06As0.77P0.23/ Ga0.94Mn0.06As bilayer, in which the easy axis in one layer is oriented out-of-plane, and in the other in-plane. Magnetization reversal in this system is explored using planar Hall effect (PHE) measurements under various initial conditions and with various field-cooling orientations. Our results show that the two magnetic layers are ferromagnetically exchange-coupled, and that such coupling results in pronounced exchange-bias-like shifts of magnetic hysteresis loops during reversal of in-plane magnetization. The presence of exchange bias in this system can be understood on the basis of magnetic closure domains formed in the layer with the out-of-plane easy axis.

AB - We report the observation of exchange bias in a ferromagnetic Ga0.94Mn0.06As0.77P0.23/ Ga0.94Mn0.06As bilayer, in which the easy axis in one layer is oriented out-of-plane, and in the other in-plane. Magnetization reversal in this system is explored using planar Hall effect (PHE) measurements under various initial conditions and with various field-cooling orientations. Our results show that the two magnetic layers are ferromagnetically exchange-coupled, and that such coupling results in pronounced exchange-bias-like shifts of magnetic hysteresis loops during reversal of in-plane magnetization. The presence of exchange bias in this system can be understood on the basis of magnetic closure domains formed in the layer with the out-of-plane easy axis.

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SN - 2045-2322

VL - 9

JO - Scientific reports

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Exchange bias in ferromagnetic bilayers with orthogonal anisotropies: the case of GaMnAsP/GaMnAs combination

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