“…(4) Recently, it has been possible to experimentally observe the magnetization reversal of a few particles [39]. From such studies, to obtain the ideal microstructure to fully understand the potential of hot-deformed magnets;…”
Section: Conclusion and Future Developmentmentioning
confidence: 99%
“…I am deeply grateful to Prof. Hono, Dr. Ohkubo, Dr. Sepehri-Amin of National Institute for Materials Science (NIMS) for collaboration on the microstructure analysis of this work [18,29,30]. Insightful comments from Prof. Okamoto of the Tohoku University were an enormous help for our study [25,39]. I would also like to thank past and present members of Daido Electronics Co., Ltd. and our laboratory for generous assistance and warm encouragement.…”
“…(4) Recently, it has been possible to experimentally observe the magnetization reversal of a few particles [39]. From such studies, to obtain the ideal microstructure to fully understand the potential of hot-deformed magnets;…”
Section: Conclusion and Future Developmentmentioning
confidence: 99%
“…I am deeply grateful to Prof. Hono, Dr. Ohkubo, Dr. Sepehri-Amin of National Institute for Materials Science (NIMS) for collaboration on the microstructure analysis of this work [18,29,30]. Insightful comments from Prof. Okamoto of the Tohoku University were an enormous help for our study [25,39]. I would also like to thank past and present members of Daido Electronics Co., Ltd. and our laboratory for generous assistance and warm encouragement.…”
“…Therefore, it is essential to detect the elemental magnetization reversal events directly. Very recently, we have directly detected elemental magnetization reversal events in Nd-Fe-B hot-deformed magnets [ 25 , 26 ]. With careful evaluation of the process damage on the magnetic properties, a submicron cross-shaped pattern of Nd-Fe-B hot-deformed magnet was fabricated using mechanical polishing and focused-ion beam (FIB), as shown in Figure 6(a ).…”
Section: Experimental Magnetization Reversal Analyses For Permanent Mmentioning
confidence: 99%
“… Figure 7. Relationship between E 0 / k B T and H 0 for Samples A, B, and C. Broken lines are the linear fittings as eye guides [ 26 ] …”
Section: Experimental Magnetization Reversal Analyses For Permanent Mmentioning
confidence: 99%
“…From the experimental approaches on this issue, we re-examined the micromagnetic coercivity analysis [ 10 , 24 ]. Moreover, the detection of elemental magnetization reversal events and their thermal fluctuation behaviors were successfully performed [ 25 , 26 ].…”
Although coercivity is one of the fundamental properties of permanent magnets, it has not been well understood. In this paper, micromagnetics and thermal activation magnetization reversal theories are briefly reviewed, and then our recent macroscopic and microscopic experimental approaches for thermally activated magnetization reversal in advanced Nd-Fe-B hot-deformed magnets are explained. Our experimental results are well supported by the recent atomistic spin model calculations. Moreover, the systematic micromagnetics simulation study makes much clearer the physical picture of the thermally activated magnetization reversal process in permanent magnets.
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