Domain-wall contribution to magnetoresistance in ferromagnetic (Ga,Mn)As film

• Autorzy: Wosiński T. , Pelya O. , Figielski T. , Mąkosa A. , Morawski A. , Sadowski J. , Dobrowolski W. , Szymczak R. , Wróbel J.
• Konferencja: Conference New Materials for Magnetoelectronics, Będlewo, 3-6 May 2006
• Języki publikacji: EN

Abstrakty

EN

Simple magnetoresistive nanodevices formed by narrow constrictions of submicron width in the epitaxial film of a ferromagnetic (Ga,Mn)As semiconductor have been fabricated employing the electronbeam- lithography patterning and low-energy low-dose oxygen ion implantation. Low-temperature chargecarrier transport through the constrictions has been investigated and correlated with magnetic properties of the film. The constricted devices revealed abrupt jumps of a reduced resistance that appeared when the sweeping magnetic field crossed the regions of the coercive field of the film magnetization. In contrast, the non-constricted reference device displayed abrupt jumps of an enhanced resistance at the same values of magnetic field. We interpret the both features, whose positions on the magnetic-field scale reflect the hysteresis loop of magnetization, as manifestation of domain wall contribution to the (Ga,Mn)As film resistance. Presumably, the suppression of the weak localization effects by a domain wall located at the constriction results in a negative contribution of a domain wall to the resistance, while the spin-orbit interaction can be responsible for its positive contribution to the resistance.

Słowa kluczowe

EN

ferromagnetic semiconductor; nanostructure; domain wall; magnetoresistance

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2007
• Tom: Vol. 25, No. 2
• Strony: 351--358
• Opis fizyczny: Bibliogr. 24 poz.

Twórcy

autor

Wosiński T.

autor

Pelya O.

autor

Figielski T.

autor

Mąkosa A.

autor

Morawski A.

autor

Sadowski J.

autor

Dobrowolski W.

autor

Szymczak R.

autor

Wróbel J.

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

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