Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt

Vivek Unikandanunni; Rajasekhar Medapalli; Eric E. Fullerton; Karel Carva; Peter M. Oppeneer; Stefano Bonetti

doi:10.1063/5.0049692

Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt

Mesoscale and Nanoscale Physics 2021-06-30 v1

Authors: Vivek Unikandanunni , Rajasekhar Medapalli , Eric E. Fullerton , Karel Carva , Peter M. Oppeneer , Stefano Bonetti

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Abstract

We investigate the ultrafast spin dynamics in an epitaxial hcp(1100) cobalt thin film. By performing pump-probe magneto-optical measurements with the magnetization along either the easy or hard magnetic axis, we determine the demagnetization and recovery times for the two axes. We observe a 35% slower dynamics along the easy magnetization axis, which we attribute to magneto-crystalline anisotropy of the electron-phonon coupling, supported by our ab initio calculations. This points towards an unambiguous and previously undisclosed role of anisotropic electron-lattice coupling in ultrafast magnetism.

Keywords

magnetic anisotropy ultrafast magnetization dynamics thin film magnetism

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@article{arxiv.2008.03119,
  title  = {Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt},
  author = {Vivek Unikandanunni and Rajasekhar Medapalli and Eric E. Fullerton and Karel Carva and Peter M. Oppeneer and Stefano Bonetti},
  journal= {arXiv preprint arXiv:2008.03119},
  year   = {2021}
}

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Main text: 6 pages, 4 figures. Supplemental Material: 6 pages, 7 figures

Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt

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