Effect of depinning field on determination of angular-momentum-compensation temperature of ferrimagnets

The domain-wall (DW) motion of ferrimagnets is investigated with respect to the angular-momentum-compensation temperature T-A for a wide range of magnetic fields mu H-0(z), ranging from the depinning to flow regimes. While the DW velocity v exhibits a maximum at T-A in the flow regime regardless of mu H-0(z), the temperature at which v is maximized depends on mu H-0(z) because of the temperature dependence of the depinning field mu H-0(dep), causing difficulty in determining T-A. To solve this problem, we propose a reduced coordinate mu H-0(z )- mu H-0(dep), which reveals that v is maximized at T-A even in the depinning regime. Our work suggests that mu H-0(dep) should be identified prior to determining T-A. (C) 2018 The Japan Society of Applied Physics