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Giant magnetoresistance due to a domain wall in Fe: Ab initio study

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons126798

Perlov,  A. Y.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126918

Yaresko,  A. N.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126518

Antonov,  V. N.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Yavorsky, B. Y., Mertig, I., Perlov, A. Y., Yaresko, A. N., & Antonov, V. N. (2002). Giant magnetoresistance due to a domain wall in Fe: Ab initio study. Physical Review B, 66(17): 174422, pp. 174422-174422. doi:10.1103/PhysRevB.66.174422.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0015-30DE-F
Zusammenfassung
The magnetoresistance due to a domain wall in pure Fe was studied theoretically by means of ab initio electronic structure calculations based on a linear muffin-tin orbital method modified for noncollinear magnets. The Bloch walls were modeled by a superlattice structure in the (001) direction of the bcc lattice with alternating regions of collinear and spiral-like magnetizations. The conductivity was calculated by means of the linearized Boltzmann equation in a relaxation time approximation. The magnetoresistance due to a domain wall (DW) is presented as a function of the angle between the magnetizations, domain-wall thickness, and domain size. The orientation dependence of the magnetoresistance due to a DW in pure Fe has cos-like behavior in contrary to the giant magnetoresistance in Fe/Cr superlattices. It was also shown that the presence of Cr increases the GMR amplitude in comparison with pure Fe separated by a noncollinear domain wall of equal size. The Kronig-Penney model was used in order to show that the oscillations of GMR as a function of domain size stem from quantum well states crossing the Fermi level.