A spin torque meter with magnetic facet domains

Kyoung-Woong Moon, Changsoo Kim, Jungbum Yoon, Jun Woo Choi, Dong-Ok Kim, Kyung Mee Song, Dongseuk Kim, Byong Sun Chun and Chanyong Hwang ()
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Kyoung-Woong Moon: Korea Research Institute of Standards and Science
Changsoo Kim: Korea Research Institute of Standards and Science
Jungbum Yoon: Korea Research Institute of Standards and Science
Jun Woo Choi: Korea Institute of Science and Technology
Dong-Ok Kim: Korea Institute of Science and Technology
Kyung Mee Song: Korea Institute of Science and Technology
Dongseuk Kim: Korea Research Institute of Standards and Science
Byong Sun Chun: Korea Research Institute of Standards and Science
Chanyong Hwang: Korea Research Institute of Standards and Science

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Current-induced magnetic domain wall (DW) motion is an important operating principle of spintronic devices. Injected current generates spin torques (STs) on the DWs in two ways. One is the spin transfer from magnetic domains to the walls by the current flowing in the magnet. Current flow in attached heavy metals also generates another ST because of the spin-Hall effect. Both phenomena explain the wall motions well; therefore, their respective contribution is an important issue. Here, we show the simultaneous measurement of both torques by using magnetic facet domains that form mountain-shaped domains with straight walls. When the STs and the external magnetic field push the walls in opposite directions, the walls should have equilibrium angles to create balanced states. Such angles can be modulated by an additional in-plane magnetic field. Angle measurements distinguish the STs because each torque has a distinct mechanism related to the DW structure.

Date: 2018
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DOI: 10.1038/s41467-018-06223-z

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