Effect of Elliptical High-Frequency Field on Microwave-Assisted Magnetic Switching

The characteristic of microwave-assisted switching for an isolated particle was investigated using the Landau Lifshitz Gilbert simulation. 1) An effective component of high-frequency (HF) field is one perpendicular to the magnetization, which is in the direction of the effective field under a write field. 2) The anti-clockwise polarized component should be increased in a practical field generation layer (FGL) to obtain larger assist effect. 3) It is necessary to use an elliptically polarized field and to design a microwave-assisted magnetic recording head with FGL with consideration about the direction and the efficiency of the HF field.