All-optical measurement of interlayer exchange coupling in Fe/Pt/FePt thin films
| Autor: | M. Jaris, Holger Schmidt, F. Ganss, Cassidy Berk, Manfred Albrecht |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Coupling constant Materials science Physics and Astronomy (miscellaneous) Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter::Materials Science Magnetization Coupling (physics) Magneto-optic Kerr effect 0103 physical sciences Precession Thin film 0210 nano-technology Spectroscopy Micromagnetics |
| Popis: | Time Resolved Magneto Optic Kerr Effect spectroscopy was used to all-optically study the dynamics in exchange coupled Fe(10 nm)/Pt(x = 0–5 nm)/FePt (10 nm) thin films. As the Pt spacer decreases, the effective magnetization of the layers is seen to evolve towards the strong coupling limit where the two films can be described by a single effective magnetization. The coupling begins at x = 1.5 nm and reaches a maximum exchange coupling constant of 2.89 erg/cm2 at x = 0 nm. The films are ferromagnetically coupled at all Pt thicknesses in the exchange coupled regime (x ≤ 1.5 nm). A procedure for extracting the interlayer exchange constant by measuring the magnetic precession frequencies at multiple applied fields and angles is outlined. The dynamics are well reproduced using micromagnetic simulations. |
| Databáze: | OpenAIRE |
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