An analysis for the magnetization mode for high density magnetic recording

TLDR

The paper compares the properties of longitudinal, circular, and perpendicular magnetization modes and discusses mode transformation. The authors aim to identify obstacles to higher recording densities with longitudinal mode and propose a new perpendicular magnetic recording system. The study analyzes self‑consistent magnetization and remanent magnetization of real tape, then proposes a perpendicular magnetic recording system that uses a perpendicular anisotropy film and magnetic heads, avoiding demagnetization at high densities. Fundamental experiments confirm the feasibility of the proposed perpendicular recording system.

Abstract

By the analysis of the self-consistent magnetization and the direct observation of the remanent magnetization of a real tape, the authors discussed the obstacles which are, and will be, encountered in attaining a higher recording densities with the present magnetic recording system, which uses mainly a longitudinal magnetization mode. Then the properties of the three magnetization modes (longitudinal, circular, and perpendicular) are compared. The mode transformation is also discussed. Finally a new perpendicular magnetic recording system is proposed for high density recording. And some results of fundamental experiments are presented. The system uses the perpendicular magnetization mode which is basically free from the demagnetization in very high densities. Its realization mainly owes to the development of a perpendicular anisotropy film and perpendicular magnetic heads.