期刊
APPLIED PHYSICS LETTERS
卷 111, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4991360
关键词
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资金
- European Community under the Marie-Curie Seventh Framework program-ITN WALL [608031]
- DFG [SFB TRR173 Spin+X]
- Graduate School of Excellence Materials Science in Mainz (Mainz)
- German Minister fur Bildung und Forschung (BMBF) [05KS4WE1/6, 05KS7WE1]
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0012371]
- U.S. Department of Energy (DOE) [DE-SC0012371] Funding Source: U.S. Department of Energy (DOE)
Recent studies have shown that material structures, which lack structural inversion symmetry and have high spin-orbit coupling can exhibit chiral magnetic textures and skyrmions which could be a key component for next generation storage devices. The Dzyaloshinskii-Moriya Interaction (DMI) that stabilizes skyrmions is an anti-symmetric exchange interaction favoring non-collinear orientation of neighboring spins. It has been shown that materials systems with high DMI can lead to very efficient domain wall and skyrmion motion by spin-orbit torques. To engineer such devices, it is important to quantify the DMI for a given material system. Here, we extract the DMI at the Heavy Metal/Ferromagnet interface using two complementary measurement schemes, namely, asymmetric domain wall motion and the magnetic stripe annihilation. By using the two different measurement schemes, we find for W(5nm)/Co20Fe60B20(0.6 nm)/MgO(2 nm) the DMI to be 0.68 +/- 0.05 mJ/m(2) and 0.73 +/- 0.5 mJ/m(2), respectively. Furthermore, we show that this DMI stabilizes skyrmions at room temperature and that there is a strong dependence of the DMI on the relative composition of the CoFeB alloy. Finally, we optimize the layers and the interfaces using different growth conditions and demonstrate that a higher deposition rate leads to a more uniform film with reduced pinning and skyrmions that can be manipulated by spin orbit torques. Published by AIP Publishing.
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