Title: Magnetic characterization of self-organized ErAs clusters using telegraph noise spectroscopy
Authors: Coppinger, F ×
Genoe, Jan
Maude, DK
Kleber, X
Rigal, LB
Gennser, U
Portal, JC
Singer, KE
Rutter, P
Taskin, T
Peaker, AR
Wright, AC #
Issue Date: Mar-1998
Publisher: Published for the American Physical Society by the American Institute of Physics
Series Title: Physical Review B, Condensed Matter vol:57 issue:12 pages:7182-7189
Abstract: 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.
ISSN: 0163-1829
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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