Chirality tunneling in mesoscopic antiferromagnetic domain walls

Abstract

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.

4 pages + 2 figures, references corrected

References in corpus (6)

• Suppression of tunneling by interference in half-integer--spin particles
• Destructive quantum interference in spin tunneling problems
• Macroscopic Quantum Coherence in Molecular Magnets
• Berry's phase and Quantum Dynamics of Ferromagnetic Solitons
• Macroscopic Quantum Coherence in Ferrimagnets
• Quantum internal modes of solitons in 1d easy-plane antiferromagnet in strong magnetic field

Cited by in corpus (6)

• Chirality tunneling and quantum dynamics for domain walls in mesoscopic ferromagnets
• Topological Effects on Quantum Phase Slips in Superfluid Spin Transport
• Antiferromagnet-Based Neuromorphics Using Dynamics of Topological Charges
• Quantum hydrodynamics of spin winding
• Current-controlled chirality dynamics in a mesoscopic magnetic domain wall
• Method of Collective Degrees of Freedom in Spin Coherent State Path Integral