Investigation of a novel material for magnetoelectronics: Co2Cr0.6Fe0.4Al

Felser, C.; Heitkamp, B; Kronast, F; Schmitz, D; Cramm, S; Dürr, H A; Elmers, H-J; Fecher, G H; Wurmehl, S; Block, T; Valdaitsev, D; Nepijko, S A; Gloskovskii, A; Jakob, G; Schönhense, G; Eberhardt, W

doi:10.1088/0953-8984/15/41/010

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Investigation of a novel material for magnetoelectronics: Co₂Cr_0.6Fe_0.4Al

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Felser, C., Heitkamp, B., Kronast, F., Schmitz, D., Cramm, S., Dürr, H. A., et al. (2003). Investigation of a novel material for magnetoelectronics: Co₂Cr_0.6Fe_0.4Al. Journal of Physics: Condensed Matter, 15(41): PII S0953-8984(03)67522-3, pp. 7019-7027. doi:10.1088/0953-8984/15/41/010.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-5119-B

Abstract

Heusler compounds are promising candidates for future spintronics device applications. The electronic and magnetic properties Of Co2Cr0.6Fe0.4Al, an electron-doped derivative Of Co2CrAl, are investigated using circularly polarized synchrotron radiation and photoemission electron microscopy (PEEM). Element specific imaging reveals needle shaped Cr rich phases in a homogeneous bulk of the Heusler compound. The ferromagnetic domain structure is investigated on an element-resolved basis using x-ray magnetic circular dichroism (XMCD) contrast in PEEM. The structure is characterized by micrometre-size domains with a superimposed fine ripple structure; the lateral resolution in these images is about 100 nm. The domains look identical for Co and Fe giving evidence of a ferromagnetic coupling of these elements. No ferromagnetic contrast is observed at the Cr line. Magnetic spectroscopy exploiting XMCD reveals that the lack of magnetic moment, detected in a SQUID magnetometer, is mainly due to the moment of the Cr atom.