Dynamic Observation of Domain Speed in MAMMOS Expanding Layer.

Itoh, A.; Tanaka, Masashi; Akiyama, Masaki; Ishikawa, Takeko; Seida, T.; Nakagawa, K.

doi:10.3379/jmsjmag.25.379

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2002

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“…The experimental results agree with the results obtained in recent simulations [3], and experiments [2] on the expansion and collapse of domains. It is believed that in our experiments, the speed of the collapse process is not limited by the external field switching time.…”

Section: Discussionsupporting

confidence: 93%

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Experimental investigation of domain expansion speeds in MAMMOS

et al. 2002

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The speeds of the domain expansion and collapse processes in a magnetic amplifying magneto-optical system (MAMMOS) recording system were experimentally measured with a high-speed photodetector. Data was collected for a range of read powers and field values, the average rise and fall times were extracted, and the delay between the field switching and the domain collapse was examined. The minimum measured expansion and collapse times were 1.6 and 4.5 ns, respectively, and the field switching to collapse delay was found to be about 20 ns with a spread of 20 ns. Theories on the expansion and collapse processes and an explanation of the delay are presented.Index Terms-Magnetic domain expansion, magnetic amplifying magneto-optical system (MAMMOS), super resolution.

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Section: Discussionsupporting

confidence: 93%

“…Itoh et al have observed the collapse of a single domain in a MAMMOS readout layer using high-speed Kerr microscopy [2]. In addition, Nakatani et al [3] have modeled the expansion process using micromagnetics and Landau-Lifshitz-Gilbert equation dynamics.…”

Section: Introductionmentioning

confidence: 98%