Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers

Scientific Reports
W B RuiJ Du

Abstract

We report on the experimental and theoretical studies of cooling field (HFC) and temperature (T) dependent exchange bias (EB) in FexAu1-x/Fe19Ni81 spin glass (SG)/ferromagnet (FM) bilayers. When x varies from 8% to 14% in the FexAu1-x SG alloys, with increasing T, a sign-changeable exchange bias field (HE) together with a unimodal distribution of coercivity (HC) are observed. Significantly, increasing in the magnitude of HFC reduces (increases) the value of HE in the negative (positive) region, resulting in the entire HE∼T curve to move leftwards and upwards. In the meanwhile, HFC variation has weak effects on HC. By Monte Carlo simulation using a SG/FM vector model, we are able to reproduce such HE dependences on T and HFC for the SG/FM system. Thus this work reveals that the SG/FM bilayer system containing intimately coupled interface, instead of a single SG layer, is responsible for the novel EB properties.

References

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Jun 20, 2003·Nature·Vassil SkumryevJosep Nogués
Dec 19, 2006·Nature Materials·Mannan AliRobert L Stamps
Mar 22, 2013·Physical Review Letters·A K NayakC Felser
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Citations

Sep 15, 2016·ACS Applied Materials & Interfaces·Shuang ZhouShuai Dong
Apr 18, 2019·Nanotechnology·Yong HuAn Du
Apr 9, 2020·Nanotechnology·Qiang Lu, Yong Hu
Mar 13, 2021·Physical Chemistry Chemical Physics : PCCP·Sagarika NayakSubhankar Bedanta
May 15, 2021·ACS Applied Materials & Interfaces·Yechao LingQingyu Xu
Aug 19, 2020·ACS Applied Materials & Interfaces·Marcin PerzanowskiMarta Marszalek

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