TITLE

Anomalous Hall effect in quarternary Heusler-type Ni50Mn17Fe8Ga25 melt-spun ribbons

AUTHOR(S)
Zhiyong Zhu; Siu Wing Or; Guangheng Wu
PUB. DATE
July 2009
SOURCE
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p032503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The anomalous Hall effect (AHE) in quarternary Heusler-type Ni50Mn17Fe8Ga25 melt-spun ribbons is investigated. Experimental correlation between saturated anomalous Hall resistivity (ρAMS) and longitudinal resistivity (ρxx) is achieved for the low-temperature martensitic phase and the high-temperature austenitic phase as ρAMS∞ρxxn=4.2 and ρAMS∞ρxxn=2.1, respectively. The unexpectedly large exponent of n=4.2 in the martensitic phase is found to contradict the traditional theory of AHE with n=1–2, but it can be explained by a side-jump model beyond the short-range limit as a result of the intermediate-range spin-dependent electron scattering by relatively large Mn-rich clusters instead. The restoration of the exponent back to a normal value of n=2.1 in the austenitic phase is ascribed to the domination of the electron scattering by phonons, compared to that by the Mn-rich clusters, at elevated temperatures and with phonon softening in the transverse-acoustic TA2 mode.
ACCESSION #
43398079

 

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