Magnetic Interactions with Strain Gradient in Ultrathin Pr0.67Sr0.33MnO3 Films

Bangmin Zhang; Ping Yang; Jun Ding; Jingsheng Chen; Gan Moog Chow

doi:10.1016/j.eng.2024.04.014

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Engineering ›› 2024, Vol. 40 ›› Issue (9) : 158-165. DOI: 10.1016/j.eng.2024.04.014

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Magnetic Interactions with Strain Gradient in Ultrathin Pr_0.67Sr_0.33MnO₃ Films

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Abstract

Strain gradient is a normal phenomenon around a heterostructural interface in ultrathin film, and it is important to determine its effect on magnetic interactions to understand interfacial coupling. In this work, ultrathin Pr_0.67Sr_0.33MnO₃ (PSMO) films on different substrates are studied. For PSMO film under different in-plane strain conditions, the saturated magnetization and Curie temperature can be qualitatively explained by double-exchange interaction and the Jahn-Teller distortion. However, the difference in the saturated magnetization with zero field cooling and 5 T field cooling is proportional to the strain gradient. Strain-gradient-induced structural disorder is proposed to enhance phonon-electron antiferromagnetic interactions and the corresponding antiferromagnetic-to-ferromagnetic phase transition via a strong magnetic field during the field cooling process. A non-monotonous structural transition of the MnO₆ octahedral rotation can enlarge the strain gradient in PSMO film on a SrTiO₃ substrate. This work demonstrates the existence of the flexomagnetic effect in ultrathin manganite film, which should be applicable to other complex oxide systems.

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Strain gradient / Manganite film / Octahedral rotation / Flexomagnetic / Magnetic interactions / Phase transition

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Bangmin Zhang, Ping Yang, Jun Ding, Jingsheng Chen, Gan Moog Chow. Magnetic Interactions with Strain Gradient in Ultrathin Pr_0.67Sr_0.33MnO₃ Films. Engineering, 2024, 40(9): 158‒165 https://doi.org/10.1016/j.eng.2024.04.014

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