Journal article
Thermal exchange bias field drift in field cooled Mn83Ir17/Co70Fe30 thin films after 10 keV He ion bombardment



Publication Details
Authors:
Ehresmann, A.; Schmidt, C.; Weis, T.; Engel, D.
Publication year:
2011
Journal:
Journal of Applied Physics
Pages range:
023910
Volume number:
109
ISSN:
0021-8979

Abstract
The thermal exchange bias field drift of sputter deposited Mn83Ir17(15 nm)/Co70Fe30(10 nm)/Ta thin films at room temperature after 10 keV He+ ion bombardment in an externally applied in-plane magnetic field for different ion fluences was studied. Although field cooling of the layer system resulted in a temporally stable exchange bias field at room temperature the exchange bias field starts to drift after ion bombardment like in non-annealed samples. Between 1 and 648 h after ion bombardment a logarithmic increase in the absolute magnitude of the exchange bias field is observed. A tentative model is presented for its description based on noninteracting domains in the antiferromagnet. A comparison between experimental data and the model reveals the delicate interplay between the ion bombardment modified average antiferromagneticanisotropy constants, exchange coupling constants, and relaxation time distributions in the polycrystalline layer system influencing the thermal drift velocities.


Research Areas


Last updated on 2019-25-07 at 13:28