Chirality tunneling in mesoscopic antiferromagnetic domain walls

Details Chirality tunneling in mesoscopic antiferromagnetic domain walls Chirality tunneling in mesoscopic antiferromagnetic domain walls

1998-03-02

arxiv.org/abs/cond-mat/9803018v2

Phys. Rev. B v.58, 11514 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages + 2 figures, references corrected

Scientific paper

10.1103/PhysRevB.58.11514

We consider a domain wall in the mesoscopic quasi-one-dimensional sample (wire or stripe) of weakly anisotropic two-sublattice antiferromagnet, and estimate the probability of tunneling between two domain wall states with different chirality. Topological effects forbid tunneling for the systems with half-integer spin S of magnetic atoms which consist of odd number of chains N. External magnetic field yields an additional contribution to the Berry phase, resulting in the appearance of two different tunnel splittings in any experimental setup involving a mixture of odd and even N, and in oscillating field dependence of the tunneling rate with the period proportional to 1/N.

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