Extracting free-energy landscapes of AgMn spin glass thin films with 1/$$f$$ resistance fluctuations

Journal Article · 17 December 2024 · Physical Review. B

DOI: https://doi.org/10.1103/PhysRevB.110.214205 · OSTI ID:2480550

Tsai, Kan-Ting ^[1]; Dahlberg, E. Dan ^[2]; Orbach, Raymond L ^[3]

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1. University of Minnesota, Minneapolis, MN (United States); Physics and Astronomy Department, University of Minnesota, Minneapolis, Minnesota
2. University of Minnesota, Minneapolis, MN (United States)
3. University of Texas at Austin, TX (United States)

The temperature-dependent 1/f noise is reported for AgMn (12 at. %) thin films with multiple thicknesses ranging from 15 to 80 nm. A significant increase in the noise magnitude occurs in the spin-glass state. Analysis of the temperature-dependent exponent provides information on the energy barrier distribution and height, which in turn are related to the spin-glass coherence length. Here, we compare our results with those obtained previously on CuMn (13.5 at. %) thin films with similar thicknesses. We observe a similar trend of the increase of the barrier height with respect to thickness, but with relatively lower values for the AgMn barriers as compared to CuMn.

• Research Organization: University of Texas at Austin, TX (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
• Grant/Contract Number: SC0013599
• OSTI ID: 2480550
• Journal Information: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 110; ISSN 2469-9950
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English