Distinct domain-wall motion between creep and flow regimes near the angular momentum compensation temperature of ferrimagnet

TL;DR

This study explores how magnetic domain walls in ferrimagnets behave differently in creep and flow regimes near the angular momentum compensation temperature, revealing regime-dependent dynamics crucial for spintronic applications.

Contribution

It demonstrates the distinct temperature-dependent behaviors of domain-wall motion in creep and flow regimes near T_A, highlighting the regime-specific dynamics in ferrimagnets.

Findings

DW speed sharply increases at T_A in flow regime due to antiferromagnetic dynamics

DW speed increases monotonically with temperature in creep regime

Thermal activation governs DW dynamics in creep regime near T_A

Abstract

We investigate a magnetic domain-wall (DW) motion in two dynamic regimes, creep and flow regimes, near the angular momentum compensation temperature (T_A) of ferrimagnet. In the flow regime, the DW speed shows sharp increase at T_A due to the emergence of antiferromagnetic DW dynamics. In the creep regime, however, the DW speed exhibits a monotonic increase with increasing the temperature. This result suggests that, in the creep regime, the thermal activation process governs the DW dynamics even near T_A. Our result unambiguously shows the distinct behavior of ferrimagnetic DW motion depending on the dynamic regime, which is important for emerging ferrimagnet-based spintronic applications.