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We demonstrate that the angular momentum compensation temperature $T_A$, atwhich the net angular momentum in the sample disappears, can be controlled inHo$_3$Fe$_5$O$_{12}$ by partially substituting Dy for Ho. The $T_A$ can bedetected using the Barnett effect, by which mechanical rotation magnetizes anobject due to spin-rotation coupling. We found that $T_A$ increases with the Dycontent and clarified that the $T_A$ of Ho$_{1.5}$Dy$_{1.5}$Fe$_5$O$_{12}$coincides with room temperature. The Barnett effect enables us to explorematerials applicable to magnetic devices utilizing the angular momentumcompensation only by rotating the powder sample at room temperature.

Angular momentum compensation manipulation to room temperature of the ferrimagnet Ho$_{3-x}$Dy$_x$Fe$_5$O$_{12}$ detected by the Barnett effect