Rotational magnetocaloric effect (RMCE) is achieved by simply rotating magnetic material in a constant magnetic field, offering a simpler and more efficient method for magnetic refrigeration compared to conventional methods. In general, strong magnetic anisotropy is required to obtain sizable RMCE, explaining why in-plane RMCE is rarely observed in thin films due to the usually weak in-plane magnetic anisotropy. In this work, we demonstrate that pronounced in-plane magnetic anisotropy can be achieved by controlling the shape of electronic phase separation ferromagnetic regions in $\mathrm{L}{\mathrm{a}}_{0.425}\mathrm{P}{\mathrm{r}}_{0.2}\mathrm{C}{\mathrm{a}}_{0.375}\mathrm{Mn}{\mathrm{O}}_3$ thin films grown on (001) $\mathrm{NdGa}{\mathrm{O}}_3$ substrates. Isothermal magnetization measurements reveal that the system exhibits an in-plane rotating entropy change $-\mathrm{\Delta }{S}_{\mathrm{rot}}=1.77\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$ near $T_{\mathrm{C}}\approx 155$ K with relative cooling power of 23.78 $\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}$. The successful realization of such sizable in-plane RMCE is important for chip-integrated solid-state refrigeration for microelectronic and spintronic platforms.

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• Magnetic anisotropy
• Magnetocaloric effect
• Magnetic refrigeration
• Magnetic thin films