Metastable, epitaxial PrCo7 films with high energy product


Metastable, epitaxial PrCo7 films with high energy product

Patra, A. K.; Neu, V.; Fähler, S.; Grötzschel, R.; Schultz, L.

Epitaxial Pr–Co films with a nominal composition of Pr2Co17 have been prepared on a Cr buffered MgO (110) substrate. Pole figures and magnetic measurements reveal that these Pr–Co films crystallize in a metastable disordered hexagonal PrCo7 phase (TbCu7 type) rather than an ordered rhombohedral Pr2Co17 phase (Th2Zn17 type). Consequently high uniaxial anisotropy at room temperature is observed instead of the planar anisotropy expected for the rhombohedral phase. The energy density obtained in the nonequilibrium Pr–Co films is (BH)max=277 kJ/m3, which exceeds the (BH)max values of single phase Sm–Co films and Sm–Co/Fe and Pr–Co/Co multilayers.

  • Applied Physics Letters 89(2006), 142512

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Publ.-Id: 8908