Macroscopic Quantum Tunneling of a Domain Wall in a Ferromagnetic Metal
Gen Tatara, Hidetoshi Fukuyama (Department of Physics, University, of Tokyo, 7-3-1 Hongo, Tokyo 113, Japan)
TL;DR
This paper investigates the quantum tunneling behavior of domain walls in ferromagnetic metals, revealing that ohmic dissipation persists at zero temperature due to gapless excitations, especially affecting thin walls and weak ferromagnets.
Contribution
It introduces a model for macroscopic quantum tunneling in ferromagnetic metals considering dissipation from gapless excitations, a novel aspect compared to insulating magnets.
Findings
Ohmic dissipation exists at zero temperature due to Stoner excitations.
Dissipative effects are significant in thin walls and weak ferromagnets.
Results align with recent experimental observations on ferromagnets with strong anisotropy.
Abstract
The macroscopic quantum tunneling of a planar domain wall in a ferromagnetic metal is studied based on the Hubbard model. It is found that the ohmic dissipation is present even at zero temperature due to the gapless Stoner excitation, which is the crucial difference from the case of the insulating magnet. The dissipative effect is calculated as a function of width of the wall and is shown to be effective in a thin wall and in a weak ferromagnet. The results are discussed in the light of recent experiments on ferromagnets with strong anisotropy. PACS numbers:75.60.Ch, 03.65.Sq, 75.10.Lp
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