Extraction of the spin-glass free-energy landscape from 1/f noise measurements

David C Harrison, E. Dan Dahlberg, Raymond L. Orbach

Research output: Contribution to journalArticlepeer-review


The 1/f resistance noise has been measured in thin CuMn (13.5 at.%) spin-glass films. The temperature and frequency dependence have been analyzed in terms of the landscape of free-energy barriers. This analysis provides the full barrier distribution for various thin film thicknesses between 10 nm and 80 nm. The free-energy barrier height distribution's width and energy position have been determined. Contrary to previous models with fixed shape and energy, the free-energy landscape is described by a distribution of barriers that both shifts and changes shape as the temperature is reduced. The dependence of this distribution is in contrast with recent predictions. Using the fluctuation dissipation theorem, the 1/f measurements connect with χ″, displaying agreement with other direct measurements of the latter.

Original languageEnglish (US)
Article number014413
JournalPhysical Review B
Issue number1
StatePublished - Jan 1 2022

Bibliographical note

Funding Information:
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award DE-SC0013599. Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nanotechnology Coordinated Infrastructure (NNCI) under Award No. ECCS-2025124. Part of this work was performed at the Institute for Rock Magnetism (IRM) at the University of Minnesota. The IRM is a U.S. National Multi-user Facility supported through the Instrumentation and Facilities program of the National Science Foundation, Earth Sciences Division, under Award No. 1642268 (NSF EAR-1642268), and by funding from the University of Minnesota.

Publisher Copyright:
© 2022 American Physical Society.


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