4 kOe and (b) H dc  = 30 kOe, H ac  = 0.6 kOe. Figure 6a,b also compares the trajectories of the magnetization projected onto the x-y plane. The early stages of magnetization switching are shown in Figure 6c,d.

These trajectories are apparently different when large-angle magnetization precession is Temsirolimus concentration observed at H dc = 30 kOe with H ac = 0.6 kOe. This qualitatively agrees with the magnetization behaviors shown in Figure 3a,b, which also suggests the shift of the unstable region due to the Selleck JNJ-26481585 incident angles. Figure 5 Switching fields of Stoner-Wohlfarth grain as a parameter of dc field incident angle at 0 K. With incident angles of (a) 0°, (b) 15°, (c) 30°, and (d) 45°. Figure 6 Trajectories P505-15 of magnetization projected onto the x – z plane for Stoner-Wohlfarth

grains at 0 K. They are under the field condition of (a) H dc = 31 kOe, H ac = 0.4 kOe and (b) H dc = 30.0 kOe, H ac = 0.6 kOe. The field incident angle is 45°. (c, d) Present trajectories of magnetization projected onto the x-y plane in the early stage of magnetization switching processes corresponding to (a) and (b), respectively. Although the data is not shown, a great reduction in H SW was also confirmed at T = 400 K when the incident angle was large. These advantages ensure magnetization switching of high K u materials by magnetic fields that are practical in device applications such as hard disk drives. During the magnetization switching process of the ECC grain, the magnetization of the soft layer will rotate first under the external field while providing an exchange field to the hard layer to effectively rotate its magnetization, thereby achieving a lower switching field. Soft magnetic layers thicker than their exchange length induce complex incoherent magnetization switching.

This means that magnetization mechanisms in the Calpain ECC grain cannot be analyzed using the theoretical treatment. Therefore, micromagnetic calculations are required to analyze the stability of magnetization switching in the ECC grain. Figure 7 presents the switching field of the ECC grain with incident angles of 0°, 15°, 30°, and 45° when applying a microwave frequency of 15 GHz. In comparison with the switching field of the Stoner-Wohlfarth grain, a significant reduction in switching fields is obtained in the calculated H ac field range. The switching field is minimum when the incident angle is 30°, which is smaller than that for the Stoner-Wohlfarth grain. This tendency is a well-known characteristic in ECC grains in the absence of microwave fields. The abrupt change in H SW is also clearly seen at H ac = 0.6 kOe when the incident angle is 0°. This implies that the magnetization behavior of the ECC grain can be classified into the three solution regions of the stability matrix, which is similar to the case of Stoner-Wohlfarth grains.