Chiral anomalous Hall effect in reentrant AuFe alloys

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F. Wolff Fabris, P. Pureur, and J. Schaf
Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501970 Porto Alegre, RS, Brazil

V. N. Vieira
Instituto de Física e Matemática, Universidade Federal do Pelotas, Caixa Postal 354, 96010900 Pelotas, RS, Brazil

I. A. Campbell
Laboratoire des Colloïdes, Verres, et Nanomateriaux, Université Montpellier II, 34095 Montpellier, France

Received 6 September 2006; published 8 December 2006

TheHall effect has been studied in a series of AuFesamples in the reentrant concentration range, as well as inpart of the spin-glass range. An anomalous Hall contribution linkedto the tilting of the local spins can be identified,confirming theoretical predictions of a different topological Hall term inducedwhen chirality is present. This effect can be understood interms of Aharonov-Bohm-like intrinsic current loops arising from successive scatteringsby canted local spins. The experimental measurements indicate that thechiral signal persists, meaning scattering within the nanoscopic loops remainscoherent, up to temperatures of the order of 150 K.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.214201
DOI:	10.1103/PhysRevB.74.214201
PACS:	75.10.Nr; 64.60.Fr; 72.10.Fk; 75.50.Lk 75.10.Nr Spin-glass and other random models (magnetism) 64.60.Fr Equilibrium properties near critical points, critical exponents 72.10.Fk Carrier scattering by point defects, dislocations, surfaces, and other imperfections including Kondo effect 75.50.Lk Spin glasses and other random magnets YEAR: 2006
KEYWORDS:	gold alloys, iron alloys, ferromagnetic materials, Hall effect, chirality

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