R&D: Magnetisation Switching of ECC Grains in MAMR

AIP Advances as published an article written by Simon John Greaves, Hiroaki Muraoka, RIEC, Tohoku University, Katahira 2-1-1, Aoba ku, Sendai 980-8577, Japan, and Yasushi Kanai, IEE, Niigata Institute of Technology, Kashiwazaki 945-1195, Japan.

Structure of the planar write head.
The pole tip width was 30nm and the trailing shield gap was 30nm.

Abstract: “Microwave-assisted magnetic recording was investigated using a planar write head and exchange-coupled composite (ECC) media. When recording on ECC media using a planar head field distribution and the high frequency field generated by a spin torque oscillator it was possible to switch the media magnetisation into the opposite direction to the head field, i.e. the media effectively had a negative coercive field. The conditions for this effect to occur are discussed.“