Spin-current-mediated Rapid Magnon Localisation and Coalescence After Ultrafast Optical Pumping of Ferrimagnetic Alloys

Overview

Journal Nat Commun

Specialty Biology

Date 2019 Apr 17

PMID 30988403

Citations 6

Authors

E Iacocca

T-M Liu

A H Reid

Z Fu

S Ruta

P W Granitzka

E Jal

S Bonetti

A X Gray

C E Graves

R Kukreja

Z Chen

D J Higley

T Chase

L Le Guyader

K Hirsch

H Ohldag

W F Schlotter

G L Dakovski

G Coslovich

M C Hoffmann

S Carron

A Tsukamoto

A Kirilyuk

A V Kimel

Th Rasing

J Stohr

R F L Evans

T Ostler

R W Chantrell

M A Hoefer

T J Silva

H A Durr

Affiliations

Soon will be listed here.

Abstract

Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty in experimentally probing such rapid dynamics. Here, we find evidence of a universal rapid magnetic order recovery in ferrimagnets with perpendicular magnetic anisotropy via nonlinear magnon processes. We identify magnon localisation and coalescence processes, whereby localised magnetic textures nucleate and subsequently interact and grow in accordance with a power law formalism. A hydrodynamic representation of the numerical simulations indicates that the appearance of noncollinear magnetisation via optical pumping establishes exchange-mediated spin currents with an equivalent 100% spin polarised charge current density of 10 A cm. Such large spin currents precipitate rapid recovery of magnetic order after optical pumping. The magnon processes discussed here provide new insights for the stabilization of desired meta-stable states.

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