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  • Title: Sidewall oxide effects on spin-torque- and magnetic-field-induced reversal characteristics of thin-film nanomagnets.
    Author: Ozatay O, Gowtham PG, Tan KW, Read JC, Mkhoyan KA, Thomas MG, Fuchs GD, Braganca PM, Ryan EM, Thadani KV, Silcox J, Ralph DC, Buhrman RA.
    Journal: Nat Mater; 2008 Jul; 7(7):567-73. PubMed ID: 18536721.
    Abstract:
    The successful operation of spin-based data storage devices depends on thermally stable magnetic bits. At the same time, the data-processing speeds required by today's technology necessitate ultrafast switching in storage devices. Achieving both thermal stability and fast switching requires controlling the effective damping in magnetic nanoparticles. By carrying out a surface chemical analysis, we show that through exposure to ambient oxygen during processing, a nanomagnet can develop an antiferromagnetic sidewall oxide layer that has detrimental effects, which include a reduction in the thermal stability at room temperature and anomalously high magnetic damping at low temperatures. The in situ deposition of a thin Al metal layer, oxidized to completion in air, greatly reduces or eliminates these problems. This implies that the effective damping and the thermal stability of a nanomagnet can be tuned, leading to a variety of potential applications in spintronic devices such as spin-torque oscillators and patterned media.
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