Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session K22: Control and Detection of Skyrmions: from Fundamentals to Applications
8:00 AM–11:00 AM,
Wednesday, March 7, 2018
LACC
Room: 402A
Sponsoring
Units:
GMAG DMP
Chair: Kab-Jin Kim, KAIST
Abstract ID: BAPS.2018.MAR.K22.1
Abstract: K22.00001 : Structure, Energetics, and Deterministic Writing of Skyrmions in Thin Film Ferromagnets*
8:00 AM–8:36 AM
Presenter:
Felix Buettner
(Massachusetts Inst of Tech-MIT)
Authors:
Felix Buettner
(Massachusetts Inst of Tech-MIT)
Ivan Lemesh
(Massachusetts Inst of Tech-MIT)
Michael Schneider
(Max Born Institute)
Bastian Pfau
(Max Born Institute)
Christian Günther
(TU Berlin)
Piet Hessing
(Max Born Institute)
Jan Geilhufe
(Max Born Institute)
Lucas Caretta
(Massachusetts Inst of Tech-MIT)
Dieter Engel
(Max Born Institute)
Benjamin Krüger
(Institute for Laser Technologies)
Jens Viefhaus
(DESY)
Stefan Eisebitt
(Max Born Institute)
Geoffrey Beach
(Massachusetts Inst of Tech-MIT)
This problem has now been solved. In this talk, I will present a unified theory that analytically approximates the energy, including stray fields, of isolated skyrmions of all sizes with 1% precision [1]. I will show that there are two types of skyrmions, "stray field skyrmions" and "DMI skyrmions", with rigorous and practical distinction criteria. I will furthermore show that our model can predict materials with sub-10 nm skyrmions at zero field and room temperature, where those skyrmions can be moved with velocities exceeding 1000 m/s at reasonable current densities of 1012 A/m2.
Experimentally, I will show that skyrmions can be nucleated by spin-orbit torque current pulses [2]. In contrast to spin-orbit torque switching of uniformly magnetized MRAM cells, skyrmion nucleation does not require any in-plane fields to be applied. The nucleation mechanism is robust, ultra-fast (sub-nanosecond), and extremely easy to implement. I will discuss the mechanism of the skyrmion generation and explain why DMI can replace the need for in-plane fields.
[1] Büttner et al., Nat Phys. 11, 225 (2015).
[2] Woo et al., Nat Mater. 15, 501 (2016).
[3] Moreau-Luchaire et al., Nat Nano. 11, 444 (2016).
[4] Boulle et al., Nat Nano. 11, 449 (2016).
[5] Büttner et al., arXiv:1704.08489
[6] Büttner et al., Nat Nano. 12, 1040 (2017).
*This work was supported by the U.S. Department of Energy and the German Science Foundation.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.K22.1
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