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Since the chirality by the inversion symmetry breaking has been observed in magnetic ordered system,[1] researches on the system with asymmetric exchange coupling were actively investigated.[2] Here, diverse reports proves that the chirality affects to the dynamic and static characteristics of spin phenomena, so it also influences on the magnetization switching.[3-6] However, in the view of the converse way, it can be also interpreted that analyzing a variation of the magnetization switching in a chiral spin system can be one option to understand an influence of the chirality on the system.
In this report, we successfully detected the system energy variation induced by the interaction between spin-orbit torque-driven artificial spin texture and Dzyaloshinskii-Moriya interaction (DMI) in laterally modulated PMA system. The effect of chiral spin texture can be confirmed by measuring magnetization switching because the chirality reversal also occurs simultaneously (clockwise (CW) ↔ counter-clockwise (CCW)). Here, more (less) energy should be required for switching the stabilized (destabilized) spin texture, which results in an additional effective magnetic field manifested itself as the shift of hysteresis loop. The resultant degree of effective field is well explained by a theoretical model derived from the Hamiltonian of DMI and micromagnetic simulations, directly confirming relationship between the chirality-dependent magnetization switching and the system energy variation.
References
[1] M. Bode et al. Nature 447, 190-193 (2007).
[2] S.-H. Yang et al. Nature Reviews Physics 3, 328-343 (2021).
[3] D.-S. Han, et al. Nano Lett. 16, 4438–4446 (2016).
[4] D.-S. Han, et al. Nat. Mater. 18, 703–708 (2019).
[5] H. Wu, et al. Nano Lett. 21, 515–521 (2021).
[6] S. An, et al. Appl. Phys. Lett. 120, 262402 (2022).
