Anisotropic ultrafast spin dynamics in epitaxial cobalt

Unikandanunni, Vivek (author): Stockholms universitet,Fysikum,Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden.

Medapalli, Rajasekhar (author): Univ Calif San Diego, Ctr Memory & Recording Res, San Diego, CA 92093 USA.;Natl Inst Technol, Sch Sci, Dept Phys, Tadepalligudem 534102, Andhra Pradesh, India.

Fullerton, Eric E. (author): Univ Calif San Diego, Ctr Memory & Recording Res, San Diego, CA 92093 USA.

Carva, Karel (author): Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Karlovu 5, CZ-12116 Prague, Czech Republic.

Bonetti, Stefano (author): Stockholms universitet,Fysikum,Ca' Foscari University of Venice, Italy,Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden.;Ca Foscari Univ Venice, Dept Mol Sci & Nanosyst, I-30172 Venice, Italy.

(creator_code:org_t)

AIP Publishing, 2021
2021
English.
In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 118:23

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Abstract Subject headings

We investigate the ultrafast spin dynamics in an epitaxial hcp(11⎯⎯00) 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 time for the two axes. We observe an average of 33% 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 toward an unambiguous and previously undisclosed role of anisotropic electron–lattice coupling in ultrafast magnetism.

By the author/editor: Unikandanunni, V ...; Medapalli, Rajas ...; Fullerton, Eric ...; Carva, Karel; Oppeneer, Peter ...; Bonetti, Stefano

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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