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Misorientation angle dependence of bicrystal magnetoresistance within the model of coherent rotation

Robert Gunnarsson (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Maj Hanson (Institutionen för experimentell fysik, Fasta tillståndets fysik)
Journal of Physics: Condensed Matter Vol. 16 (2004), 21, p. 3761-3768.
[Artikel, refereegranskad vetenskaplig]

The bicrystal magnetoresistance hysteresis is studied within the model of coherent rotation of magnetization. The magnetoresistance hysteresis is calculated numerically in the limit of fully spin polarized current for symmetric bicrystal junctions with biaxial magnetic anisotropy and of varying misorientation angles. The shape of the curves obtained from the model displays different characteristic features, depending on the angular relationships, which are consistent with experimental data from the literature. The results show a magnetoresistance increasing with increasing misorientation angle. The influence of biaxial magnetocrystalline anisotropy is reflected in a hump in the maximum magnetoresistance curve at around a misorientation angle of 25 degrees. This structure is absent in the case of uniaxial anisotropy.

Nyckelord: bicrystal, magnetoresistance, Stoner-Wohlfarth model



Denna post skapades 2006-08-29. Senast ändrad 2015-10-22.
CPL Pubid: 287

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik
Institutionen för experimentell fysik, Fasta tillståndets fysik (1997-2004)

Ämnesområden

Fysik

Chalmers infrastruktur