Magnetic and chemical order in Heusler alloys containing cobalt and manganese

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Abstract

Saturation magnetization, X-ray and neutron diffraction measurements have been made on ferromagnetic alloys at the compositions Co2MnAl, Co2MnSi, Co2MnGa, Co2MnGe, Co2MnSn and Co2MnSb. The alloys have the Heusler, L21, chemical structure and are highly ordered except for Co2MnAl which exhibits extensive preferential Mn−Al disorder and Co2MnSb which contains the 2 approximate phases Co1·5MnSb and Co.

This is the first series of Heusler alloys in which magnetic moments have been definitely observed on atoms other than Mn. The alloys containing group IVB elements have nett moments of approximately 5·1β per molecule with individual moments of 0·75 and 3·6β on Co and Mn sites respectively. The alloys containing the group IIIB elements Al or Ga have nett moments of approximately 4β and correspondingly smaller moments on both Co and Mn sites. The non-stoichiometric alloy Co1·5 MnSb has a nett moment 4·9β and moments 0·75 and 3·76β respectively on the Co and Mn sites.

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