Calculation of domain wall resistance in magnetic nanowire

Abstract

The enhancement of domain wall resistance (DWR) in spintronic devices containing the domain wall is required for a full understanding since it represents the efficiency of spin transport and contributes to magnetoresistance phenomena. In this work, we theoretically investigate the effect of the domain wall width, injected current density, and temperature on DWR in magnetic nanowire by using the generalized spin accumulation model based on the Zhang, Levy, and Fert approach. The proposed model allows us to deal with a multilayer system with arbitrary orientation of magnetization. In addition, the temperature effect can be taken into account by considering the spin-dependent resistivity of the ferromagnet at any finite temperature. This leads to the calculation of temperature variation of spin transport parameters, and it eventually allows us to calculate the thermal effect on spin accumulation. The spin transport behavior and DWR can be calculated directly from the gradient of spin accumulation and spin current within the wall. The results show the increase in DWR with temperature as the thermal effect causes the reduction of transport parameters.

Current‐Controllable and Reversible Multi‐Resistance‐State Based on Domain Wall Number Transition in 2D Ferromagnet Fe3GeTe2

“…|Δm i | describes the gradient of spin accumulation of i and |Δm i | is the spin current density. [40][41][42] The spin accumulation is described as the gradient of the spin-up and spin-down density of states by the drift-diffusion model with the spin-up and the spin-down gradient being higher for the multi-domain-wall state compared with the less-domain-wall state. Thus, the resistance for the multidomain wall state is overall higher than that for the less-domain wall state.…”

Influence of the demagnetization on the polarization of the thermal radiation emitted by hot cobalt wires

“…4). As the typical thickness of the DW is much larger than the typical electron wavelength at the Fermi level [40], the DW offers a enhanced resistance [41][42][43][44][45][46][47][48][49] across the wire. This impedance mismatch at the DW would produce reflection of the collective charge fluctuations transverse modes thereby shrinking their available spatial range and lowering the long wavelength cutoff.…”

Influence of irreversible demagnetization on the polarization of thermal radiation emitted by a hot cobalt wire

“…4). As the typical thickness of the DW is much larger than the typical electron wavelength at the Fermi level [34], the DW offers a enhanced resistance [35][36][37][38][39][40][41] across the wire. This impedance mismatch at the DW would produce reflection of the collective charge fluctuations transverse modes thereby reducing their available spatial range and long wavelength cutoff.…”