Study on magnetization reversal of perpendicular recording media by in-field MFM observation

• Published in: Acta materialia Vol. 55; no. 9; pp. 2959 - 2964
• Main Authors: Pei, Wenli, Yuan, J., Wang, T., Fu, Y., Washiya, T., Hasagawa, T., Saito, H., Ishio, S., Honda, N.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2007; Elsevier Science
• Subjects: Activation; Applied sciences; Boundaries; Clusters; Exact sciences and technology; In-field MFM observation; Magnetic fields; Magnetization reversal; Magnetization reversal field map; Magnetization reversal process; Mathematical analysis; Metals. Metallurgy; Perpendicular recording media; Recording; Simulation; Magnetization reversal process; Perpendicular recording media; In-field MFM observation; Magnetization reversal field map; Recording material; Magnetization; Magnetic recording; Magnetic properties
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2006.12.034

In-field MFM observation technology was employed to study the perpendicular recording medium under various perpendicular magnetic fields. A magnetization reversal field ( H R) map method was performed to reveal the magnetization reversal behavior of the medium. Under low magnetic field, some specific areas firstly reversed at a random position and then these reversed areas grew up. Under a high magnetic field, the magnetization reversal process tended to occur at the boundary between the reversed area and the non-reversed area. The simulation results implied that the long-range spatial interaction exists in the real media, which results in the bigger magnetic cluster. A simple experimental method was first proposed to estimate activation volume. The experimental activation volume agreed with the result calculated by the dynamic coercivity method.