Origin of magnetic anisotropy, role of induced magnetic moment, and all-optical magnetization switching for Co100−xGdx/Pt multilayers

J. Wang; T. Seki; Y. C. Lau; Y. K. Takahashi; K. Takanashi

doi:10.1063/5.0050985

Origin of magnetic anisotropy, role of induced magnetic moment, and all-optical magnetization switching for Co_100−xGd_x/Pt multilayers

J. Wang, T. Seki^*, Y. C. Lau, Y. K. Takahashi, K. Takanashi

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

The combination of Co, Gd, and Pt materials is a representative with perpendicular magnetic anisotropy (PMA) for the all-optical switching (AOS), which provides a promising route for ultrafast magnetization manipulation. This paper shows that the PMA of Co_100−xGd_x/Pt multilayers mainly originates not from the bulk property of ferrimagnetic Co_100−xGd_x but from the interface magnetic anisotropy between the Co_100−xGd_x and Pt layers. In addition, the contribution of magnetic moment induced in Pt becomes remarkable, which modulates the compensation temperature for the samples with thin Co_100−xGd_x layers. The Co_100−xGd_x/Pt multilayers exhibited the all-optical helicity-independent switching in a wide range of Gd concentrations, and the maximum AOS probability was achieved near the compensation composition. We discuss the correlation between the magnetic properties and the AOS probability for the Co_100−xGd_x/Pt multilayers. The AOS showed clear thickness dependence, which was attributable to the remarkable contribution of induced moment. Our findings are beneficial not only for understanding the mechanism of AOS but also for designing spintronic devices using ferrimagnets.

Original language	English
Article number	061110
Journal	APL Materials
Volume	9
Issue number	6
DOIs	https://doi.org/10.1063/5.0050985
Publication status	Published - 2021 Jun 1
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)

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title = "Origin of magnetic anisotropy, role of induced magnetic moment, and all-optical magnetization switching for Co100−xGdx/Pt multilayers",

abstract = "The combination of Co, Gd, and Pt materials is a representative with perpendicular magnetic anisotropy (PMA) for the all-optical switching (AOS), which provides a promising route for ultrafast magnetization manipulation. This paper shows that the PMA of Co100−xGdx/Pt multilayers mainly originates not from the bulk property of ferrimagnetic Co100−xGdx but from the interface magnetic anisotropy between the Co100−xGdx and Pt layers. In addition, the contribution of magnetic moment induced in Pt becomes remarkable, which modulates the compensation temperature for the samples with thin Co100−xGdx layers. The Co100−xGdx/Pt multilayers exhibited the all-optical helicity-independent switching in a wide range of Gd concentrations, and the maximum AOS probability was achieved near the compensation composition. We discuss the correlation between the magnetic properties and the AOS probability for the Co100−xGdx/Pt multilayers. The AOS showed clear thickness dependence, which was attributable to the remarkable contribution of induced moment. Our findings are beneficial not only for understanding the mechanism of AOS but also for designing spintronic devices using ferrimagnets.",

author = "J. Wang and T. Seki and Lau, {Y. C.} and Takahashi, {Y. K.} and K. Takanashi",

note = "Funding Information: The authors thank I. Narita for technical support to do the composition analysis and R. Umetsu for helping to carry out the measurement of temperature dependence of the AHE. The structural characterization was performed at the Cooperative Research and Development Center for Advanced Materials, IMR, Tohoku University. This work was supported by the JSPS KAKENHI Grant-in-Aid for Scientific Research (S) (Grant No. JP18H05246), the Grant-in-Aid for Scientific Research (A) (Grant No. JP20H00299), and the Grant-in-Aid for Scientific Research (A) (Grant No. JP18H03787). Publisher Copyright: {\textcopyright} 2021 Author(s).",

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AU - Lau, Y. C.

AU - Takahashi, Y. K.

AU - Takanashi, K.

N1 - Funding Information: The authors thank I. Narita for technical support to do the composition analysis and R. Umetsu for helping to carry out the measurement of temperature dependence of the AHE. The structural characterization was performed at the Cooperative Research and Development Center for Advanced Materials, IMR, Tohoku University. This work was supported by the JSPS KAKENHI Grant-in-Aid for Scientific Research (S) (Grant No. JP18H05246), the Grant-in-Aid for Scientific Research (A) (Grant No. JP20H00299), and the Grant-in-Aid for Scientific Research (A) (Grant No. JP18H03787). Publisher Copyright: © 2021 Author(s).

PY - 2021/6/1

Y1 - 2021/6/1

N2 - The combination of Co, Gd, and Pt materials is a representative with perpendicular magnetic anisotropy (PMA) for the all-optical switching (AOS), which provides a promising route for ultrafast magnetization manipulation. This paper shows that the PMA of Co100−xGdx/Pt multilayers mainly originates not from the bulk property of ferrimagnetic Co100−xGdx but from the interface magnetic anisotropy between the Co100−xGdx and Pt layers. In addition, the contribution of magnetic moment induced in Pt becomes remarkable, which modulates the compensation temperature for the samples with thin Co100−xGdx layers. The Co100−xGdx/Pt multilayers exhibited the all-optical helicity-independent switching in a wide range of Gd concentrations, and the maximum AOS probability was achieved near the compensation composition. We discuss the correlation between the magnetic properties and the AOS probability for the Co100−xGdx/Pt multilayers. The AOS showed clear thickness dependence, which was attributable to the remarkable contribution of induced moment. Our findings are beneficial not only for understanding the mechanism of AOS but also for designing spintronic devices using ferrimagnets.

AB - The combination of Co, Gd, and Pt materials is a representative with perpendicular magnetic anisotropy (PMA) for the all-optical switching (AOS), which provides a promising route for ultrafast magnetization manipulation. This paper shows that the PMA of Co100−xGdx/Pt multilayers mainly originates not from the bulk property of ferrimagnetic Co100−xGdx but from the interface magnetic anisotropy between the Co100−xGdx and Pt layers. In addition, the contribution of magnetic moment induced in Pt becomes remarkable, which modulates the compensation temperature for the samples with thin Co100−xGdx layers. The Co100−xGdx/Pt multilayers exhibited the all-optical helicity-independent switching in a wide range of Gd concentrations, and the maximum AOS probability was achieved near the compensation composition. We discuss the correlation between the magnetic properties and the AOS probability for the Co100−xGdx/Pt multilayers. The AOS showed clear thickness dependence, which was attributable to the remarkable contribution of induced moment. Our findings are beneficial not only for understanding the mechanism of AOS but also for designing spintronic devices using ferrimagnets.

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Origin of magnetic anisotropy, role of induced magnetic moment, and all-optical magnetization switching for Co_100−xGd_x/Pt multilayers

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