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Phys. Rev. B 72, 172405 (2005) [4 pages]

Persistent spin current in mesoscopic ferrimagnetic spin ring

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Jing-Nuo Wu and Ming-Che Chang
Department of Physics, National Taiwan Normal University, Taipei, Taiwan

Min-Fong Yang
Department of Physics, Tunghai University, Taichung, Taiwan

Received 16 July 2005; revised 16 September 2005; published 8 November 2005

Using a semiclassical approach, we study the persistent magnetization current of a mesoscopic ferrimagnetic ring in a nonuniform magnetic field. At zero temperature, there exists persistent spin current because of the quantum fluctuation of magnons, similar to the case of an antiferromagnetic spin ring. At a low temperature, the current shows activation behavior because of the field-induced gap. At a higher temperature, the magnitude of the spin current is proportional to temperature T, similar to the reported result of a ferromagnetic spin ring.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.172405
DOI:
10.1103/PhysRevB.72.172405
PACS:
75.10.Jm, 75.10.Pq, 75.30.Ds, 73.23.Ra
 
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