Abstract
Magnetic recording of a hard disk drive is negatively affected by a trilemma of noise, thermal fluctuation, and writability, which prevents high recording density. Microwave-assisted magnetic recording (MAMR) is a promising recording method for solving this trilemma. In this study, methods for increasing the AC-field frequency generated from a field generation layer (FGL) and recording performance were investigated using a micromagnetic simulator in consideration of magnetic interactions of an MAMR system. Firstly, we discuss methods for increasing the frequency of the AC-field by changing saturation magnetization (Ms) of the FGL. When the Ms of the FGL decreased, the AC-field amplitude decreased and its frequency increased. When the Ms of the FGL was lower than 1.4 T, the frequency was larger than 20 GHz. Secondly, we discuss the recording performances. As a result, to improve recording performance, high frequency of AC-field (> 20 GHz) is more important than the strength of STO field.
