Gerber A, Kishon I, Korenblit IY, Riss O, Segal A, Karpovski M, Raquet B. Linear positive magnetoresistance and quantum interference in ferromagnetic metals.
Phys Rev Lett 2007;
99:027201. [PMID:
17678250 DOI:
10.1103/physrevlett.99.027201]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2007] [Revised: 03/28/2007] [Indexed: 05/16/2023]
Abstract
Positive, linear in field, and isotropic magnetoresistance in fields up to 60 T is found in geometrically constrained ferromagnets, such as thin films of iron, nickel, and cobalt and their granular mixtures with nonmagnetic materials. The resistivity measured as a function of temperature shows a minimum at temperatures reaching a remarkably high 92 K, followed by logarithmic dependence at low temperatures. We propose to explain both phenomena by a modified version of the quantum electron-electron interaction theory. The agreement is only qualitative while the observed magnitude of the magnetoresistance slope is much larger than the calculated one.
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