Magnetization Switching Time for Hard/Soft Magnetic Composite Pillar

Junsuke Matsuzaki, Terumitsu Tanaka, Hiroki Kurisu, Setsuo Yamamoto

Research output: Contribution to journalArticlepeer-review


A hard/soft magnetic composite pillar array medium(CPA media) is proposed for Tera-bits/inch<sup>2</sup> recording. The recording frequency of 1.5 GHz is considered to be necessary to obtain high data rate with 1 Tbits/inch<sup>2</sup> recording rensity. A magnetization switching time for the single hard/soft magnetic composite pillar was evaluated using a micromagnetic simulator based on the Landau-Lifshitz-Gilbert equation. The switching time less than 0.33 nano second was found to be attained by appropriately setting the damping constant, the incident angle of applied field, and the exchange constant between the hard and soft magnetic units. The influence of the neighboring pillars in the array was also evaluated. The CPA media was found to be available for the high frequency recording corresponding to 1.5 GHz.
Original languageEnglish
Pages (from-to)415-418
Number of pages4
JournalTransactions of the Materials Research Society of Japan
Issue number3
Publication statusPublished - 2009


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