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Probing the timescale of the exchange interaction in a ferromagnetic alloy
Open accessAbstract
The underlying physics of all ferromagnetic behavior is the cooperative interaction between individual atomic magnetic moments that results in a macroscopic magnetization. In this work, we use extreme ultraviolet pulses from high-harmonic generation as an element-specific probe of ultrafast, optically driven, demagnetization in a ferromagnetic Fe-Ni alloy (permalloy). We show that for times shorter than the characteristic timescale for exchange coupling, the magnetization of Fe quenches more strongly than that of Ni. Then as the Fe moments start to randomize, the strong ferromagnetic exchange interaction induces further demagnetization in Ni, with a characteristic delay determined by the strength of the exchange interaction. We can further enhance this delay by lowering the exchange energy by diluting the permalloy with Cu. This measurement probes how the fundamental quantum mechanical exchange coupling between Fe and Ni in magnetic materials influences magnetic switching dynamics in ferromagnetic materials relevant to next-generation data storage technologies.
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Cited by
Bright Coherent Ultrahigh Harmonics in the keV X-ray Regime from Mid-Infrared Femtosecond Lasers
Popmintchev, T., Chen, M.-C., Popmintchev, D., Arpin, P., Brown, S., Ališauskas, S., Andriukaitis, G., Balčiunas, T., Mücke, O. D., Pugzlys, A., et al. (2012) · Science · doi:10.1126/science.1218497 · Cited by 1,830
Self-citationEngineered materials for all-optical helicity-dependent magnetic switching
Mangin, S., Gottwald, M., Lambert, C.-H., Steil, D., Uhlíř, V., Pang, L., Hehn, M., Alebrand, S., Cinchetti, M., Malinowski, G., et al. (2014) · Nature Materials · doi:10.1038/nmat3864 · Cited by 666
Self-citationSpin angular momentum and tunable polarization in high-harmonic generation
Fleischer, A., Kfir, O., Diskin, T., Sidorenko, P., & Cohen, O. (2014) · Nature Photonics · doi:10.1038/nphoton.2014.108 · Cited by 612
Generation of bright phase-matched circularly-polarized extreme ultraviolet high harmonics
Kfir, O., Grychtol, P., Turgut, E., Knut, R., Zusin, D., Popmintchev, D., Popmintchev, T., Nembach, H., Shaw, J. M., Fleischer, A., et al. (2015) · Nature Photonics · doi:10.1038/nphoton.2014.293 · Cited by 527
Self-citationUltrafast magnetization enhancement in metallic multilayers driven by superdiffusive spin current
Rudolf, D., La-O-Vorakiat, C., Battiato, M., Adam, R., Shaw, J. M., Turgut, E., Maldonado, P., Mathias, S., Grychtol, P., Nembach, H. T., et al. (2012) · Nature Communications · doi:10.1038/ncomms2029 · Cited by 401
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Metadata
- Authors
- Mathias, S., La-O-Vorakiat, C., Grychtol, P., Granitzka, P., Turgut, E., Shaw, J. M., Adam, R., Nembach, H. T., Siemens, M. E., Eich, S., Schneider, C. M., Silva, T. J., Aeschlimann, M., Murnane, M. M., & Kapteyn, H. C.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2012-03-12
- Volume
- 109
- Issue
- 13
- Pages
- 4792-4797
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2026894968
- Cited by
- 255
- References
- 0
- FWCI
- 13.79
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Mathias, S., La-O-Vorakiat, C., Grychtol, P., Granitzka, P., Turgut, E., Shaw, J. M., Adam, R., Nembach, H. T., Siemens, M. E., Eich, S., Schneider, C. M., Silva, T. J., Aeschlimann, M., Murnane, M. M., & Kapteyn, H. C. (2012). Probing the timescale of the exchange interaction in a ferromagnetic alloy. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1201371109
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