Altering the magnetic ordering of Fe3Ga4 via thermal annealing and hydrostatic pressure

Wilfong, Brandon; Sharma, Vaibhav; Naphy, Jared; Bishop, Omar; Bennett, Steven; Prestigiacomo, Joseph; Barua, Radhika; Jamer, Michelle E.

doi:10.1016/j.jallcom.2021.162421

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Dual-component anomalous Hall effect in a helical spin-spiral metamagnet

Prestigiacomo,

Jamer,

Callahan

et al. 2024

Applied Physics Letters

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We report a dual-component anomalous Hall effect (AHE) in polycrystalline Fe3Ga4 thin films grown on STO (001) and Al2O3 substrates. Systematic magnetic and magnetotransport measurements reveal an AHE consisting of positive and negative contributions that coexist across a wide range of temperatures and magnetic phases. We find that both magnitudes are nearly equal in the low-temperature ferromagnetic (FM) phase, but that their relative ratio is reduced upon heating through the antiferromagnetic helical spin-spiral state where they compete with metamagnetism and topological Hall effects, maintaining finite values at least up to the high-temperature FM phase.

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