脉冲激光沉积制备La_(0.62)Ca_(0.29)K_(0.09)MnO_3外延膜及其磁热性能

Magnetocaloric Effect of La_(0.62)Ca_(0.29)K_(0.09)MnO_3 Epitaxial Film Prepared by Pulsed Laser Deposition

采用脉冲激光沉积法在单晶SrTiO3(STO)基底上制备了La0.62Ca0.29K0.09MnO3(LCKMO)薄膜,通过调控基底温度获得了平整致密的膜层.利用二维面探X射线衍射仪和高分辨透射电子显微镜对薄膜结构进行了表征.结果表明,薄膜呈高质量取向外延生长,对应关系为{001}LCKMO||{001}STO.对薄膜的磁热性能研究表明,5 T下最大磁熵变为3.45 J/(kg·K),相对制冷效率为379.5 J/kg,磁熵半峰宽为110 K.

La0.62Ca0.29K0.09MnO3（LCKMO） film was epitaxially grown on the （001）SrTiO3（STO） single crystal substrate by pulsed laser deposition and a smooth and dense film was obtained by controlling the substrate temperature. The structure was characterized by 2D X-ray area detector and high resolution transmission electron microscopy, and the results indicate a high quality oriented growth of the film with the relationship of { 001 / LCKMO [ I { 001 / STO. At the magnetic field of 5 T, the maximum magnetic entropy change and relative cooling power of the film is 3.45 J/（ kg . K） and 379.5 J/kg, respectively. A notable case is that the full width at half maximum of I ASu I is 110 K, which is desirable for the Ericsson cycle, the excellent magneto caloric effect of the LCKMO film reveals its great applicative potentialities as magnetic cooling refrigerant.