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Giant magnetocaloric effects by tailoring the phase transitions
7.O. Beckman and L. Lundgren, in Handbook of Magnetic Materials, edited by K. H. J. Buschow (Elsevier, New York, 1991), Vol. 6, Chap. 3.
21.B. Hernando, J. L. Sánchez Llamazares, V. M. Prida, D. Baldomir, D. Serantes, M. Ilyn, and J. González, Appl. Phys. Lett. 94, 222502 (2009).
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The MnCoGe alloy can crystallize in either the hexagonal - or the orthorhombic TiNiSi-type of structure. In both phases MnCoGe behaves like a typical ferromagnet with a second-order magnetic phase transition. For with B on interstitial positions, we discover a giant magnetocaloric effect associated with a single first-order magnetostructuralphase transition, which can be achieved by tuning the magnetic and structural transitions to coincide. The results obtained on the MnCoGe-type alloys may be extensible to other types of magnetic materials undergoing a first-order structural transformation and can open up some possibilities for searching magnetic refrigerants for room-temperature applications.
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