Exchange biased FeNi/FeMn bilayers with coercivity and switching field enhanced by FeMn surface oxidation
Savin, Peter A.
Lepalovskij, V. N.
Vas'kovskiy, V. O.
García Arribas, Alfredo
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AIP Advances 3(9) : (2013) // Article N. 092104
FeNi/FeMn bilayers were grown in a magnetic field and subjected to heat treatments at temperatures of 50 to 350 degrees C in vacuum or in a gas mixture containing oxygen. In the as-deposited state, the hysteresis loop of 30 nm FeNi layer was shifted. Low temperature annealing leads to a decrease of the exchange bias field. Heat treatments at higher temperatures in gas mixture result in partial oxidation of 20 nm thick FeMn layer leading to a nonlinear dependence of coercivity and a switching field of FeNi layer on annealing temperature. The maximum of coercivity and switching field were observed after annealing at 300 degrees C.