New Materials of RMn2Ge2 Type for Thermomagnetic Devices |
| P.E. Markin, S.V. Zemlyanskii and N.V. Baranov Ural State University, Ekaterinburg, Russia |
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| The new type of the working media for thermomagnetic devices is proposed: the intermetallic compounds which have large magnetocrystalline anisotropy and exhibit the spontaneous phase transition from the antiferromagnetic (AF) to ferromagnetic (F) state when the temperature increases above the critical value Tt. Moreover, the anisotropy in AF state in the fields below the critical AF-F transition field must be much lower than in the F state. In the present paper the Gd0.6Sm0.4Mn2Ge2 compound belonging to the tetragonal RMn2Ge2 system is investigated. This compound has the critical temperature Tt = 280 K. The thermomagnetic cycle can be realized on the AF-F-AF transition near Tt2. The interval of the working temperatures can be shifted with the change of the Gd and Sm concentration. |
| DOI: 10.12693/APhysPolA.92.327 PACS numbers: 71.20.Lp, 72.15.Jf, 75.30.Gw |