It is well known that CsCl‐type FeRh undergoes from antiferromagnetic (AFM) to ferromagnetic (FM) phase transition near room temperature with large thermal hysteresis. Therefore, it is particularly essential to find new methods to manipulate the magnetic order of FeRh and reduce thermal hysteresis. Herein, the magnetic phase transition of FeRh film by applying a low‐frequency in‐plane alternating current (AC) magnetic field is successfully manipulated. It is found that under the AC magnetic field, the phase transition of the FM–AFM is promoted, and the heating branch shifts at a rate of −8 K T−1, which causes the thermal hysteresis of FeRh reduction of about 2 K. These phenomena may be attributed to the Zeeman energy and the periodic vibration of domain walls. This work provides the possibility for the realization of low‐power spintronic devices.

We investigated the magnetization reversal and domain wall motion-like boundary expansion of the stripe domain region in ultrathin FeCo/Pt multilayers with perpendicular magnetic anisotropy. We found that magnetization reversal is realized in two steps, and the proportion of these two steps changes with the repeat number and the thickness of the magnetic layer. The stripe domain structure appears during the magnetization reversal and is responsible for the two-step magnetization reversal process. The repeat number and magnetic layer thickness have an obvious effect on the size of the stripe domain. The boundary of the stripe domain region expands just like a domain wall when it is driven by a magnetic field, and the velocity follows the creep law which is consistent with typical domain walls.

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In this work, we investigate the linear relationship between domain wall creep parameters, and evaluate the effect of material parameters on magnetic domain wall creep in a series of Pt/Co/Pt multilayers with perpendicular magnetic anisotropy. The results for the samples with different magnetic layer thicknesses verify the linear relationship between the domain wall creep parameters, which is because both of the domain wall creep parameters are proportional to the Co layer thickness. With the assistance of surface acoustic waves, the domain wall creep parameters also follow the linear relationship, by which the relationship between the anisotropy energy density K and local pinning strength fpin is obtained as fpin∝K18. The above linear relationship does not exist in annealed samples because annealing breaks the relationship between the local pinning strength and material parameters.

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