Spin-Motive Force Caused by Vortex Gyration in a Circular Nanodisk with Holes

Moon, Jung Hwan; Lee, Kyung Jin

doi:10.4283/jmag.2011.16.1.006

Journal of Magnetics

2011

DOI: 10.4283/jmag.2011.16.1.006

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Spin-Motive Force Caused by Vortex Gyration in a Circular Nanodisk with Holes

Jung Hwan Moon¹,

Kyung Jin Lee²

Abstract: Spin-motive force has drawn attention because it contains a fundamental physical property. Spin-motive force creates effective electric and magnetic fields in moving magnetization; a vortex is a plausible system for observing the spin-motive force because of the abrupt profile of magnetization. However, the time-averaged value of a spin-motive force becomes zero when a vortex core undergoes gyroscopic motion. By means of micromagnetic simulation , we demonstrates that a non-zero time-averaged electric field in… Show more

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Cited by 4 publications

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“…A spatiotemporal change in the magnetization generates a spin-dependent electric field, which in turn induces an electromotive force and produces a finite voltage; i.e., SMF. [22][23][24] Numerous theoretical and numerical studies have addressed its fundamental physics, [25][26][27][28][29][30] which has been experimentally confirmed in various systems. 14,[31][32][33] For a ferromagnetic system without RSOC, the conventional spin-dependent electric field is given by…”

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confidence: 99%

Electrical Detection of Polarity and Chirality of a Magnetic Vortex Using Spin-Motive Force Caused by Rashba Spin–Orbit Coupling

Moon¹,

Kim²,

Lee³

et al. 2012

Appl. Phys. Express

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We theoretically investigate the Rashba spin-motive force generated by a gyroscopic motion of a magnetic vortex in the presence of Rashba spin–orbit coupling. We show that the Rashba spin-motive force depends on not only the polarity of a vortex core but also the chirality of a vortex. Both polarity and chirality can be simultaneously determined by measuring electric signals. Our finding may be useful to electrically read the information of a magnetic vortex (i.e., polarity and chirality) for device applications, and to estimate the strength of Rashba spin–orbit coupling in a ferromagnet even when it is small.

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mentioning

confidence: 99%

Electrical Detection of Polarity and Chirality of a Magnetic Vortex Using Spin-Motive Force Caused by Rashba Spin–Orbit Coupling

Moon¹,

Kim²,

Lee³

et al. 2012

Appl. Phys. Express

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Self-consistent calculation of spin transport and magnetization dynamics

et al. 2013

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A spin-polarized current transfers its spin-angular momentum to a local magnetization, exciting various types of current-induced magnetization dynamics. So far, most studies in this field have focused on the direct effect of spin transport on magnetization dynamics, but ignored the feedback from the magnetization dynamics to the spin transport and back to the magnetization dynamics. Although the feedback is usually weak, there are situations when it can play an important role in the dynamics. In such situations, simultaneous, self-consistent calculations of the magnetization dynamics and the spin transport can accurately describe the feedback. This review describes in detail the feedback mechanisms, and presents recent progress in self-consistent calculations of the coupled dynamics. We pay special attention to three representative examples, where the feedback generates non-local effective interactions for the magnetization after the spin accumulation has been integrated out. Possibly the most dramatic feedback example is the dynamic instability in magnetic nanopillars with a single magnetic layer. This instability does not occur without non-local feedback. We demonstrate that full self-consistent calculations generate simulation results in much better agreement with experiments than previous calculations that addressed the feedback effect approximately.The next example is for more typical spin valve nanopillars. Although the effect of feedback is less dramatic because even without feedback the current can make stationary states unstable and induce magnetization oscillation, the feedback can still have important consequences. For instance, we show that the feedback can reduce the linewidth of oscillations, in agreement with experimental observations. A key aspect of this reduction is the suppression of the excitation of short wave length spin waves by the non-local feedback.Finally, we consider nonadiabatic electron transport in narrow domain walls. The non-local feedback in these systems leads to a significant renormalization of the effective nonadiabatic 3 spin transfer torque. These examples show that the self-consistent treatment of spin transport and magnetization dynamics is important for understanding the physics of the coupled dynamics and for providing a bridge between the ongoing research fields of current-induced magnetization dynamics and the newly emerging fields of magnetization-dynamics-induced generation of charge and spin currents.

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Spin-motive force due to a gyrating magnetic vortex

et al. 2012

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A change of magnetic flux through a circuit induces an electromotive force. By analogy, a recently predicted force that results from the motion of non-uniform spin structures has been termed the spin-motive force. Although recent experiments seem to confirm its presence, a direct signature of the spin-motive force has remained elusive. Here we report the observation of a real-time spin-motive force produced by the gyration of a magnetic vortex core. We find a good agreement between the experimental results, theory and micromagnetic simulations, which taken as a whole provide strong evidence in favour of a spin-motive force.

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Spin-Motive Force Caused by Vortex Gyration in a Circular Nanodisk with Holes

Cited by 4 publications

References 22 publications

Electrical Detection of Polarity and Chirality of a Magnetic Vortex Using Spin-Motive Force Caused by Rashba Spin–Orbit Coupling

Electrical Detection of Polarity and Chirality of a Magnetic Vortex Using Spin-Motive Force Caused by Rashba Spin–Orbit Coupling

Self-consistent calculation of spin transport and magnetization dynamics

Spin-motive force due to a gyrating magnetic vortex

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