Magnetic characterization of self-organized ErAs clusters using telegraph noise spectroscopy | Zendy

F. Coppinger | Zendy; Jan Genoe | Zendy; D. K. Maude | Zendy; Xavier Kléber | Zendy; Laurent Rigal | Zendy; U. Gennser | Zendy; J.C. Portal | Zendy; K.E. Singer | Zendy; P. Rutter | Zendy; T. Taskin | Zendy; А. R. Peaker | Zendy; Andrew Wright | Zendy

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Magnetic characterization of self-organized ErAs clusters using telegraph noise spectroscopy

Author(s) -

F. Coppinger,

Jan Genoe,

D. K. Maude,

Xavier Kléber,

Laurent Rigal,

U. Gennser,

J.C. Portal,

K.E. Singer,

P. Rutter,

T. Taskin,

А. R. Peaker,

Andrew Wright

Publication year - 1998

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.57.7182

Subject(s) - mesoscopic physics , condensed matter physics , magnetization , quantum tunnelling , materials science , spectroscopy , magnetic field , cluster (spacecraft) , conductance , anisotropy , noise (video) , physics , optics , quantum mechanics , artificial intelligence , computer science , image (mathematics) , programming language

We have studied the magnetic properties of self-organized ErAs aggregates embedded in a GaAs matrix using telegraph noise spectroscopy. The electrical transport through the samples is mesoscopic and exhibits universal conductance fluctuations and two-level fluctuations (TLF's). A statistical analysis of a TLF allows us to measure the extremely small magnetization of an isolated ErAs cluster. Rotating the sample in a magnetic field reveals the sixfold magnetic anisotropy expected for ErAs with a rocksalt structure. At high temperatures the switching is thermally activated, while at low temperatures it is the tunneling of the magnetization which dominates. The magnetic-field dependence of the crossover temperature between the thermally activated and tunneling regimes can be explained with a simple model.status: publishe

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