What is it about?

Ferromagnetic metal nanolayer with large perpendicular magnetic anisotropy (PMA) energy and small magnetic damping constant are crucial for high-speed spintronic devices. In this study, sub-terahertz magnetization dynamics with large PMA energy in Cu2Sb-type (Mn-Cr)AlGe films are investigated by an all-optical method. The precession frequency of 0.164 THz with a small effective magnetic damping constant of 0.012 is obtained.

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Why is it important?

The magnetic damping constant α is a key parameter for the efficient control of the magnetization in spintronic memory devices. Increasing the operating speed and decreasing the device size, while maintaining the low energy consumption, would require small saturation magnetization, large perpendicular magnetic anisotropy (PMA), and small α. Furthermore, materials that could possibly be grown on the thermally oxidized Si substrates are strongly desired from an industrial point of view. In this study, we demonstrated the sub-terahertz magnetization precessional motion with small α in (Mn-Cr)AlGe ultrathin films grown on thermally oxidized Si substrates. We demonstrated that the (Mn-Cr)AlGe has the magnetic properties required for future application in spintronic memory devices.

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This page is a summary of: Magnetization Precession at Sub‐Terahertz Frequencies in Polycrystalline Cu 2 Sb‐Type (Mn–Cr)AlGe Ultrathin Films, Small, April 2022, Wiley, DOI: 10.1002/smll.202200378.
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