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Evidence of local moment formation in Co-based Heusler alloys

DOI: 10.1103/PhysRevB.78.184438 DOI Help

Authors: P. S. Keatley (University of Exeter) , E. Arenholz (Lawrence Berkeley National Laboratory) , Y. Sakuraba (Tohoku University) , M. Oogane (Tohoku University) , K. Takanashi (Tohoku University) , A. Sakuma (Tohoku University) , T. Miyazaki (Tohoku University) , R. J. Hicken (University of Exeter) , N. D. Telling (Daresbury Laboratory) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 78 (18) , PAGES 184438-1/7

State: Published (Approved)
Published: November 2008

Abstract: We examine the formation of local moments in Heusler alloys of the composition Co2MnZ where Z=Si or Al using the combined techniques of x-ray magnetic circular and linear dichroism. The existence of local moments in half-metallic Heusler alloys is reliant upon the band gap in the minority-spin states. By utilizing the element-specific nature of x-ray absorption techniques we are able to explore the degree of localization of moments on Co and Mn atoms. We observe a crucial difference in the localization of the Co moment when comparing Co2MnSi CMS and Co2MnAl films that is consistent with the predicted larger minority-spin gap in the Co partial density of states for CMS. These results provide important evidence for the dominant role of the Co minority-spin states in realizing half-metallic ferromagnetism in this system

Subject Areas: Physics

Instruments: NONE-No attached Diamond beamline

Other Facilities: Advanced Light Source