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Coexistence of ferromagnetic and antiferromagnetic order in Mn-doped Ni2MnGa
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© 2003 American Physical Society (APS). This is the accepted version of the following article: Enkovaara, J. & Heczko, O. & Ayuela, A. & Nieminen, Risto M. 2003. Coexistence of ferromagnetic and antiferromagnetic order in Mn-doped Ni2MnGa. Physical Review B. Volume 67, Issue 21. 212405/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.67.212405, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.67.212405.
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en
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212405/1-4
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Physical Review B, Volume 67, Issue 21
Abstract
Ni-Mn-Ga is interesting as a prototype of a magnetic shape-memory alloy showing large magnetic-field-induced strains. We present here results for the magnetic ordering of Mn-rich Ni-Mn-Ga alloys based on both experiments and theory. Experimental trends for the composition dependence of the magnetization are measured by a vibrating sample magnetometer in magnetic fields of up to several tesla and at low temperatures. The saturation magnetization has a maximum near the stoichiometric composition and it decreases with increasing Mn content. This unexpected behavior is interpreted via first-principles calculations within the density-functional theory. We show that extra Mn atoms are antiferromagnetically aligned to the other moments, which explains the dependence of the magnetization on composition. In addition, the effect of Mn doping on the stabilization of the structural phases and on the magnetic anisotropy energy is demonstrated.
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Enkovaara, J. & Heczko, O. & Ayuela, A. & Nieminen, Risto M. 2003. Coexistence of ferromagnetic and antiferromagnetic order in Mn-doped Ni2MnGa. Physical Review B. Volume 67, Issue 21. 212405/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.67.212405.