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MA: Magnetismus

MA 20: Exchange Bias und Coupling

MA 20.6: Talk

Friday, March 15, 2002, 11:45–12:00, H10

Are configurational magnetic rearrangements the cause for the exchange bias? — •Peter Weinberger — Center for Computational Materials Science TU-Wien Getreidemarkt 9/158, A1060 Wien, Österreich

By considering collinear and non-collinear magnetic configurations the interlayer exchange energy can be viewed as a continuous energy parameter є that can directly be correlated with the magnetoresistance. It is shown for the spin-valve system Co(111)/Co₆/(CoO)_n/ Co₆/Cu₆/Co₆/Co(111), n = 6,12, that the exchange bias refers to that value of є below which the magnetoresistance remains zero. Above this value a gradual change in the magnetoresistance is observed when considering non-collinear magnetic configurations. All calculations are performed in terms of the fully relativistic spin-polarized versions of the Screened Korringa-Kohn-Rostoker (KKR-) method and the Kubo-Greenwood equation.