Now showing items 41-60 of 7164

    • ISU Special Announcement- March 24, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-24)
    • ISU Today- March 24, 2021

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    • ISU Today- March 23, 2021

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    • Strong ultrafast demagnetization due to the intraband transitions

      Zhang, G. P.; Murakami, Mitsuko (Institute of Physics, 2023-08)
      Demagnetization in ferromagnetic transition metals driven by a femtosecond laser pulse is a fundamental problem in solid state physics, and its understanding is essential to the development of spintronic devices. Ab initio calculation of time-dependent magnetic moment in the velocity gauge so far has not been successful in reproducing the large amount of demagnetization observed in experiments. In this work, we propose a method to incorporate intraband transitions within the velocity gauge through a convective derivative in the crystal momentum space. Our results for transition-element bulk crystals (bcc Fe, hcp Co and fcc Ni) based on the time-dependent quantum Liouville equation show a dramatic enhancement in the amount of demagnetization after the inclusion of an intraband term, in agreement with experiments. We also find that the effect of intraband transitions on each ferromagnetic material is distinctly different because of their band structure and spin property differences. Our finding has a far-reaching impact on understanding of ultrafast demagnetization.
    • ISU Today- March 22, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-22)
    • ISU Today- March 19, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-19)
    • ISU Special Announcement- March 18, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-18)
    • ISU Today- March 18, 2021

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    • ISU Today- March 17, 2021

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    • ISU Today- March 16, 2021

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    • ISU Today- March 15, 2021

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    • ISU Today- March 12, 2021

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    • ISU Today- March 11, 2021

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    • ISU Today- March 10, 2021

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    • ISU Today- March 9, 2021

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    • ISU Today- March 8, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-08)
    • ISU Today- March 5, 2021

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    • ISU Today- March 4, 2021

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    • ISU Today- March 3, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-03)
    • ISU Today- March 2, 2021

      Indiana State University. Communications and Marketing/University Communications (Indiana State University, 2021-03-02)