Strongly temperature-dependent interlayer Dzyaloshinskii-Moriya interaction from a ferrimagnetic rare-earth–transition-metal alloy

As a material platform for spintronics, ferrimagnets have garnered considerable attention because of their unique behavior. Recently, interlayer Dzyaloshinskii-Moriya interaction (DMI) has significantly heightened interest in its ability to design three-dimensional long-range chiral spin textures, thereby promising enhancements in the performance of magnetic random-access memory devices. To date, experimental reports primarily focused on the observation of interlayer DMI and its field-free switching capability, while systematic investigations into the temperature dependence of interlayer DMI in ferrimagnetic systems are lacking. Here, we experimentally observe a record-high interlayer DMI effective field and demonstrate the strongly temperature-dependent interlayer DMI strength within a trilayer system incorporating the ferrimagnet TbFe. Our results show that temperature can significantly manipulate the strength of interlayer DMI in trilayer structures composed of a ferrimagnetic rare-earth and transition-metal alloy, consistent with first-principles calculations. These insights herald an effective methodology to modulate the strength of interlayer DMI, offering significant advantages for the prospective development of semiconductor devices based on interlayer DMI.