Anomalous Hall effect in L10-MnAl films with controllable orbital two-channel Kondo effect

Abstract

The anomalous Hall effect (AHE) in strongly disordered magnetic systems has been buried in persistent confusion despite its long history. We report the AHE in perpendicularly magnetized L10-MnAl epitaxial films with variable orbital two-channel Kondo (2CK) effect arising from the strong coupling of conduction electrons and the structural disorders of two-level systems. The AHE is observed to excellently scale with pAH/f=a0pxx0+bpxx2 at high temperatures where phonon scattering prevails. In contrast, significant deviation occurs at low temperatures where the orbital 2CK effect becomes important, suggesting a negative AHE contribution. The deviation of the scaling agrees with the orbital 2CK effect in the breakdown temperatures and deviation magnitudes.

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• Engineering the polar magneto-optical Kerr effect in strongly strained L10-MnAl films
• Intrinsic nature of the giant spin Hall conductivity of Pt
• Electrical Transport of perpendicularly magnetized L10-MnGa and MnAl films
• Anomalous resistivity upturn in epitaxial L21-Co2MnAl films