Fast current-driven domain walls and small skyrmions in a compensated ferrimagnet

Nature Nanotechnology
Lucas CarettaGeoffrey S D Beach

Abstract

Spintronics is a research field that aims to understand and control spins on the nanoscale and should enable next-generation data storage and manipulation. One technological and scientific key challenge is to stabilize small spin textures and to move them efficiently with high velocities. For a long time, research focused on ferromagnetic materials, but ferromagnets show fundamental limits for speed and size. Here, we circumvent these limits using compensated ferrimagnets. Using ferrimagnetic Pt/Gd44Co56/TaOx films with a sizeable Dzyaloshinskii-Moriya interaction, we realize a current-driven domain wall motion with a speed of 1.3 km s-1 near the angular momentum compensation temperature (TA) and room-temperature-stable skyrmions with minimum diameters close to 10 nm near the magnetic compensation temperature (TM). Both the size and dynamics of the ferrimagnet are in excellent agreement with a simplified effective ferromagnet theory. Our work shows that high-speed, high-density spintronics devices based on current-driven spin textures can be realized using materials in which TA and TM are close together.

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Citations

Nov 16, 2019·Nature Communications·Takaaki DohiHideo Ohno
Jul 21, 2020·Scientific Reports·Hyun-Seok Whang, Sug-Bong Choe
Aug 4, 2020·Advanced Materials·Jingyan ZhangShouguo Wang
Aug 25, 2019·Nature Communications·Sebastian MeyerStefan Heinze
Jul 22, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Eduardo MartínezÓscar Alejos
Aug 21, 2020·Advanced Materials·Shanquan ChenZuhuang Chen
Apr 3, 2019·Nature Nanotechnology·Can Onur AvciGeoffrey S D Beach
Jul 24, 2020·Physical Review Letters·Jaechul ShimKyung-Jin Lee
Mar 2, 2019·Physical Review Letters·Se Kwon KimYaroslav Tserkovnyak
Jan 12, 2019·Nature Communications·M L M LalieuB Koopmans
Oct 20, 2019·Nature Communications·Saül VélezPietro Gambardella
Jun 4, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tomasz Blachowicz, Andrea Ehrmann
Nov 17, 2020·Small·Zhi Shiuh LimAriando Ariando
Jan 13, 2021·Advanced Materials·Robert StreubelFrances Hellman
Feb 5, 2021·Nature·Hariom JaniPaolo G Radaelli
Dec 15, 2020·Nature Communications·Andrada-Oana MandruHans Josef Hug
Mar 20, 2021·Nano Letters·Roméo JugeOlivier Boulle
Jul 31, 2021·Nature Nanotechnology·Mantao HuangGeoffrey S D Beach

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Methods Mentioned

BETA
X-ray
electron beam lithography

Software Mentioned

MicroMagnum micromagnetic simulation package
MOKE

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