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This work reveals a giant, current-direction-dependent anisotropic magnetoresistance (AMR) in single-crystal bcc FeNi alloys. The authors demonstrate that the AMR ratio for current along the 100 versus 110 crystal directions reaches a record 87 at 5 K. This effect exhibits a dramatic, nearly tenfold enhancement upon cooling---unlike the temperature-stable AMR observed in CoFe alloys. They further show that this material concurrently exhibits ultralow Gilbert damping (~2. 310^-3) with negligible dependence on magnetization orientation. The unique combination of a giant, tunable magnetoresistance and low damping establishes bcc FeNi as a promising candidate for advanced magnetic memory and sensing technologies.
Fan et al. (Fri,) studied this question.
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