Helical magnetism, characterized by a spiral spin arrangement, holds immense potential for novel spintronic devices. Achieving room temperature manipulation and detection of this intriguing magnetic order remains a significant challenge. Here, we report the successful realization of room temperature chirality switching and detection in a helimagnetic MnAu₂ thin film.

Utilizing a combination of advanced thin-film deposition techniques and cutting-edge magneto-optical Kerr effect (MOKE) microscopy, we fabricated a high-quality MnAu₂ film exhibiting a well-defined helical magnetic order. The film exhibits a critical temperature (T_c) above room temperature, allowing for practical applications.

By applying precisely controlled magnetic fields, we demonstrate reversible switching between left- and right-handed chirality of the helical spin structure. This dynamic control is attributed to the unique magnetic anisotropy of the MnAu₂ film, allowing for manipulation of the chirality with relative ease.

Furthermore, the MOKE microscopy reveals clear signatures of the chirality, providing a sensitive and non-invasive method for its detection. The distinct optical response of the film, depending on the chirality, enables the development of efficient optical read-out mechanisms for potential spintronic devices.

This breakthrough paves the way for room temperature spintronic functionalities based on chiral magnetic textures. The ability to switch and detect chirality opens new possibilities for data storage, magnetic sensing, and novel logic devices, offering exciting prospects for future technological advancements.