Exchange bias effect of current Joule thermally modulated inverted vertical (Co/Pt) n/Co/IrMn nanomultilayers

The exchange bias has a crucial influence on the key performance parameters of magneroresistive sensor, which wide applications in many fields. This paper presents method that uses Joule heating effect combined with magnetic field to modulate multilayers. By this method, we systematically in-plane (<i>H</i><sub>eb</sub>) inverted (Co/Pt)<sub><i>n</i></sub>/Co/IrMn structure (<i>n</i> + 1 is repetition Co layers), here thickness Pt layer smaller than layer. In these structures, <i>H</i><sub>eb</sub> can be continuously modulated by changing amplitude pulse current <i>I</i><sub>DC</sub> (an <i>H</i><sub>p</sub>) after fixing an <i>H</i><sub>p</sub> (<i>I</i><sub>DC</sub>). more detail, deceases gradually increasing and its polarity reversed finally, will not disappear even under large <i>I</i><sub>DC</sub>. Furthermore, if both direction (<i>H</i><sub>p</sub>) are changed, (<i>I</i><sub>DC</sub>) fixed, reversal realized from positive (negative) negative (positive) From here, one may find modulation our text totally different normal case thinks, where becomes zero enough due pure effect. Therefore, believe above results show situ linear range sensitivity, important significance guiding optimization sensors.