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Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt

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arxiv 2008.03119 v1 pith:HQG3PXLQ submitted 2020-08-07 cond-mat.mes-hall

Vivek Unikandanunni , Rajasekhar Medapalli , Eric E. Fullerton , Karel Carva , Peter M. Oppeneer , Stefano Bonetti This is my paper · ORCID
classification cond-mat.mes-hall
keywords dynamicsultrafastalonganisotropicaxiscobaltcouplingeasy
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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.

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