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Appl. Sci. 2019, 9(4), 630; https://doi.org/10.3390/app9040630

First-Principles Prediction of Skyrmionic Phase Behavior in GdFe2 Films Capped by 4d and 5d Transition Metals

1
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
2
Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
3
Laboratory for Solid State Physics, Department of Physics, ETH Zurich, 8093 Zurich, Switzerland
4
Hefei National Laboratory, University of Science and Technology of China, Hefei 230026, Anhui, China
*
Author to whom correspondence should be addressed.
Received: 22 January 2019 / Revised: 5 February 2019 / Accepted: 8 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Recent Advances in Novel Materials for Future Spintronics)
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Abstract

In atomic GdFe 2 films capped by 4d and 5d transition metals, we show that skyrmions with diameters smaller than 12 nm can emerge. The Dzyaloshinskii–Moriya interaction (DMI), exchange energy, and the magnetocrystalline anisotropy (MCA) energy were investigated based on density functional theory. Since DMI and MCA are caused by spin–orbit coupling (SOC), they are increased with 5d capping layers which exhibit strong SOC strength. We discover a skyrmion phase by using atomistic spin dynamic simulations at small magnetic fields of ∼1 T. In addition, a ground state that a spin spiral phase is remained even at zero magnetic field for both films with 4d and 5d capping layers. View Full-Text
Keywords: skyrmion; Dzyaloshinskii–Moriya interaction; exchange energy; magnetic anisotropy skyrmion; Dzyaloshinskii–Moriya interaction; exchange energy; magnetic anisotropy
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Jekal, S.; Danilo, A.; Phuong, D.; Zheng, X. First-Principles Prediction of Skyrmionic Phase Behavior in GdFe2 Films Capped by 4d and 5d Transition Metals. Appl. Sci. 2019, 9, 630.

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