Layered antiferromagnetism with high Neel temperature in the intermetallic compound Mn2Au

Khmelevskyi, Sergii; Mohn, Peter
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p162503
Academic Journal
On the basis of earlier experimental studies the intermetallic compound Mn2Au has been characterized as a nonmagnetically ordered material. Here we report the results of first-principles calculations based on local spin-density approximation that describes Mn2Au to have a narrow band ground state with rigid local moments on the Mn sites. Calculations of the interatomic exchange constants based on the magnetic force theorem and a Monte Carlo modeling of the resulting Heisenberg-like Hamiltonian predict a high Neel temperature of ∼1600 K. This temperature is considerably higher than for the other known high-temperature antiferromagnetic L10-type Mn based binary alloys used in magnetic storage applications.


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