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Large Positive Magnetoresistance in Nonstoichiometric NiMnSb Thin Films on Silicon

Branford, W R, Clowes, S K, Syed, M H, Bugoslavsky, Y V, Gardelis, S, Androulakis, J, Giapintzakis, J, Grigorescu, C E, Berenov, A V, Roy, S B and Cohen, L F (2004) Large Positive Magnetoresistance in Nonstoichiometric NiMnSb Thin Films on Silicon Applied Physics Letters, 84 (13). ISSN 00036951

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Abstract

We report a systematic study of the transport properties of pulsed-laser-deposited NiMnSb films on silicon as a function of film thickness. A low-temperature upturn is observed in the resistivity for film thicknesses of 130 nm and below. The resistivity minimum corresponds to the maximum in the positive magnetoresistance for all samples. As the film thickness decreases, the magnitude of both the resistivity upturn and the. magnetoresistance increase. There is no feature associated with the upturn in the low-field Hall resistivity, which becomes systematically more electron dominated as the film thickness decreases and the temperature increases. This has implications for the use of NiMnSb as a spin injector for spintronic applications. The positive magnetoresistance of the 5 nm sample is greater than 100% at 200 K in 8 T. Further enhancement of the magnetoresistance occurs for field parallel, rather than perpendicular, to the film surface. The magnetoresistance behavior is compared to various model systems, including the band-gap tuning found in the silver chalcogenides, disorder-induced weak localization, and the, emerging class of "bad metal" ferromagnets.

Item Type: Article
Additional Information: Published in <i>Applied Physics Letters,</i> Vol. 84. Copyright 2004 American Institute of Physics. Click <a href=http://apl.aip.org/apl/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:09
Last Modified: 23 Sep 2013 18:28
URI: http://epubs.surrey.ac.uk/id/eprint/471

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