Ultrafast Magnetism Dynamics Measure Using Tabletop Ultrafast EUV Sources

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In our work to date, we made two significant advances. First we demonstrated element-selective demagnetization dynamics for the first time, with a record time resolution for x-ray probing of 55 fs. Second, in new work, we were able to probe the timescale of the exchange interaction in magnetic materials, also for the first time. Our measurements were made using the transverse magneto-optic Kerr effect (T-MOKE) geometry, since the reflectivity of a magnetic material changes with the direction of the magnetization vector of a surface. In our experiment, we periodically reversed the magnetization direction of a grating structure made of Permalloy ... continued below

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Silva, Thomas J. & Murnane, Margaret August 21, 2013.

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In our work to date, we made two significant advances. First we demonstrated element-selective demagnetization dynamics for the first time, with a record time resolution for x-ray probing of 55 fs. Second, in new work, we were able to probe the timescale of the exchange interaction in magnetic materials, also for the first time. Our measurements were made using the transverse magneto-optic Kerr effect (T-MOKE) geometry, since the reflectivity of a magnetic material changes with the direction of the magnetization vector of a surface. In our experiment, we periodically reversed the magnetization direction of a grating structure made of Permalloy (Ni80Fe20) using an external magnetic field. To achieve maximum contrast, we used HHG light spanning the M-shell (3p) absorption edges of Fe and Ni. Our characterization of the static magnetization of a Permalloy sample shows high magnetic asymmetry at photon energies just above and below the absorption edges at 55 eV and 65 eV, respectively. This result is in excellent agreement with measurements done on the same using a synchrotron source.

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  • Report No.: DOE-NIST-01480
  • Grant Number: SC0001480
  • DOI: 10.2172/1090757 | External Link
  • Office of Scientific & Technical Information Report Number: 1090757
  • Archival Resource Key: ark:/67531/metadc842296

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  • August 21, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 12:47 p.m.

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Silva, Thomas J. & Murnane, Margaret. Ultrafast Magnetism Dynamics Measure Using Tabletop Ultrafast EUV Sources, report, August 21, 2013; United States. (digital.library.unt.edu/ark:/67531/metadc842296/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.