| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2017: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Outline of Final Research Achievements |
The purpose of this work is to develop magnetic microscopy techniques using acoustically stimulated electromagnetic (ASEM) method and to investigate local spin dynamics induced by ultrasound waves. In particular, we aim to obtain local magnetic hysteresis parameter such as coercivity and hysteresis loss in bulk materials. Our results are that (1) we found that the dynamical magnetic loss as well as coercivity and hysteresis loss is obtained by analyzing the phase shift in the ASEM response signals, (2) microscopic images of magnetic domain structures are successfully obtained by using high-frequency ultrasound probe, and (3) we demonstrate the inspection of defects in thin steel plates or the evaluation and visualization of residual stress in steel products by irradiating ultrasound waves.
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