Tailoring the magnetization reversal of elliptical dots using exchange bias (invited).

Exchange bias effects have been studied in elliptical dots composed of ferromagnetic Ni₈₀Fe₂₀–antiferromagnetic Ir₂₀Mn₈₀ bilayers. The magnetization reversal mechanisms and magnetic configurations have been investigated by magneto-optic Kerr effect and magnetic force microscopy. Although the obtained bias fields in these dots are relatively small, the magnetization reversal is found to be influenced by the ferromagnetic–antiferromagnetic coupling. Namely, for some off-axis angles of measurement, the magnetization reversal mechanism of the Ni₈₀Fe₂₀–Ir₂₀Mn₈₀ ellipses depends on whether exchange bias is induced along the minor or major axis of the ellipses. Hence, exchange bias is shown to be an effective means for tailoring the magnetization reversal of elliptical dots after sample fabrication. [ABSTRACT FROM AUTHOR]