Generation of pairs of antiferromagnetic vortices and their dynamics at a domain wall in yttrium orthoferrite |
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Authors: | M V Chetkin Yu N Kurbatova |
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Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
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Abstract: | The stable generation of pairs of antiferromagnetic vortices at a domain wall moving at a velocity of 12 km/s is investigated at the instant it passes through a defect in a thin plate of yttrium orthoferrite. The velocities of a vortex and an antivortex moving in opposite directions along the domain wall and being accompanied by solitary flexural waves are ±16 km/s. The total velocity of antiferromagnetic vortices is close to the maximum velocity of the domain wall, 20 km/s. Such a high velocity can only be due to the action of a quite large gyroscopic force. An external dc magnetic field (±400 Oe) applied along the b axis of the orthoferrite affects this velocity insignificantly. The effective magnetic field that violates the Lorentz invariance of the dynamics considerably exceeds this value. |
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