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|標題:||Enhancement of the exchange-bias onset temperature in a columnar nanocrystalline Ni80Fe20/Co3O4 thin film||作者:||van Lierop, J.
|關鍵字:||bilayers;coercivity;anisotropy;model||Project:||Journal of Applied Physics||期刊/報告no：:||Journal of Applied Physics, Volume 99, Issue 8.||摘要:||
Typically, exchange coupling can only occur when ferromagnetic spins couple to antiferromagnetic spins below the Neel temperature. We present results on a Ni80Fe20/Co3O4 thin film that is composed of similar to 10 nm diameter nanocrystalline columns. Field cooling the film reveals low-temperature exchange-bias hysteresis loop shifts that are the same magnitude as those measured in a similar Ni80Fe20/CoO system, although the bulk magnetocrystalline anisotropy is a factor of 5 smaller. The coercivity and exchange-bias loop shift exhibit the same temperature dependence with individual "blocking" temperatures. Most surprising is that the onset temperature of the exchange-bias is nearly four times higher than the bulk Neel temperature. (C) 2006 Institute of Physics.
|Appears in Collections:||材料科學與工程學系|
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