Ferromagnetic percolation in Mn xGe 1-x dilute magnetic semiconductor

A. P. Li; J. Shen; J. R. Thompson; H. H. Weitering

doi:10.1063/1.1899768

Ferromagnetic percolation in Mn _xGe _1-x dilute magnetic semiconductor

A. P. Li, J. Shen, J. R. Thompson, H. H. Weitering

Scanning Tunneling Microscopy Group

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131 Scopus citations

Abstract

We have studied the magnetic and magnetotransport properties of Mn-doped Ge grown by molecular-beam epitaxy. This group-IV dilute ferromagnetic semiconductor exhibits two magnetic transitions. An upper critical temperature TC* (~112 K for x~0.05) is evident from the extrapolated Curie-Weiss susceptibility and from the Arrott plot analysis of anomalous Hall effect data. The existence of a lower critical temperature TC (~12 K for x~0.05) is established from ac susceptibility and magnetotransport data. The data are fully compatible with the existence of bound magnetic polarons or clusters below TC* which percolate at TC ≫ TC*.

Original language	English
Article number	152507
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	15
DOIs	https://doi.org/10.1063/1.1899768
State	Published - 2005

Funding

The authors thank L. C. Feldman for the RBS calibrations of our samples. This work was sponsored by the LDRD Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725 and by the NSF under Contract No. DMR-0306239.

Funders	Funder number
National Science Foundation
U.S. Department of Energy	DE-AC05-00OR22725
Oak Ridge National Laboratory

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title = "Ferromagnetic percolation in Mn xGe 1-x dilute magnetic semiconductor",

abstract = "We have studied the magnetic and magnetotransport properties of Mn-doped Ge grown by molecular-beam epitaxy. This group-IV dilute ferromagnetic semiconductor exhibits two magnetic transitions. An upper critical temperature TC* (~112 K for x~0.05) is evident from the extrapolated Curie-Weiss susceptibility and from the Arrott plot analysis of anomalous Hall effect data. The existence of a lower critical temperature TC (~12 K for x~0.05) is established from ac susceptibility and magnetotransport data. The data are fully compatible with the existence of bound magnetic polarons or clusters below TC* which percolate at TC ≫ TC*.",

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AB - We have studied the magnetic and magnetotransport properties of Mn-doped Ge grown by molecular-beam epitaxy. This group-IV dilute ferromagnetic semiconductor exhibits two magnetic transitions. An upper critical temperature TC* (~112 K for x~0.05) is evident from the extrapolated Curie-Weiss susceptibility and from the Arrott plot analysis of anomalous Hall effect data. The existence of a lower critical temperature TC (~12 K for x~0.05) is established from ac susceptibility and magnetotransport data. The data are fully compatible with the existence of bound magnetic polarons or clusters below TC* which percolate at TC ≫ TC*.

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Ferromagnetic percolation in Mn _xGe _1-x dilute magnetic semiconductor

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