Details

Autor(en) / Beteiligte

• Ferté, T.
• Malinowski, G.
• Terrier, E.
• Halté, V.
• Guyader, L. Le
• Holldack, K.
• Hehn, M.
• Boeglin, C.
• Bergeard, N.

Titel

Laser induced ultrafast 3d and 4f spin dynamics in CoDy ferrimagnetic alloys as a function of temperature

Ist Teil von

• Journal of magnetism and magnetic materials, 2021-07, Vol.530, p.167883, Article 167883

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report an element- and time-resolved investigation of femtosecond laser induced ultrafast dynamics of the Co 3d and Dy 4f spins in a ferrimagnetic Co80Dy20 alloy as a function of the temperature. We observe that the Co characteristic demagnetization time (τCo) remains nearly constant (~0.2 ps) on increasing the temperature. Conversely, the Dy characteristic demagnetization time (τDy) decreases from ~1 ps to ~0.4 ps with the rise of temperature. Comparing our experimental data with literature shows that τCo and τDy are independent of the alloy composition or the demagnetization amplitude and that τDy scales with the relative temperature T* = TCurie – T.