Spin and Anomalous Hall Conductivity of the Chiral Antiferromagnet PtMn3

Efficient charge-to-spin current conversion in materials is crucial to the development of spintronic memory or logic devices. A promising and established method of spin current generation is the injection of charge current through a crystal with a strong intrinsic spin Hall conductivity. Recently, a class of antiferromagnets with the composition XMn₃, where X={Pt, Ir, Rh}, have been identified as materials with large intrinsic spin Hall conductivities stemming from their non-trivial spin order [1]. The exact role of antiferromagnetic spin texture on the generated spin current, however, is not fully understood. Temperature-dependent triangular AFM - collinear AFM phase transitions in chemically ordered PtMn₃ can be exploited to probe this directly [2]. Here, we report on the growth and magneto-transport measurement of ordered PtMn₃ thin films. Harmonic transport measurement techniques utilizing spin-transfer torques were performed to determine the spin and anomalous Hall conductivities at select temperatures [3].

[1] Zhang, Y. et al. (2017). Physical Review B, 95(7).
[2] Krén, E., et al. (1968). Physical Review, 171(2).
[3] Hayashi, M. et al. (2014). Physical Review B, 89(14).