Detail publikačního výsledku

Spin stress contribution to the lattice dynamics of FePt

VON REPPERT, A.; WILLIG, L.; PUDELL, J.; ZEUSCHNER, S.; SELLGE, G.; GANSS, F.; HELLWIG, O.; ARREGI URIBEETXEBARRIA, J.; UHLÍŘ, V.; CRUT, A.; BARGHEER, M.

Originální název

Spin stress contribution to the lattice dynamics of FePt

Anglický název

Spin stress contribution to the lattice dynamics of FePt

Druh

Článek WoS

Originální abstrakt

Invar-behavior occurring in many magnetic materials has long been of interest to materials science. Here, we show not only invar behavior of a continuous film of FePt but also even negative thermal expansion of FePt nanograins upon equilibrium heating. Yet, both samples exhibit pronounced transient expansion upon laser heating in femtosecond x-ray diffraction experiments. We show that the granular microstructure is essential to support the contractive out-of-plane stresses originating from in-plane expansion via the Poisson effect that add to the uniaxial contractive stress driven by spin disorder. We prove the spin contribution by saturating the magnetic excitations with a first laser pulse and then detecting the purely expansive response to a second pulse. The contractive spin stress is reestablished on the same 100-ps time scale that we observe for the recovery of the ferromagnetic order. Finite-element modeling of the mechanical response of FePt nanosystems confirms the morphology dependence of the dynamics.

Anglický abstrakt

Invar-behavior occurring in many magnetic materials has long been of interest to materials science. Here, we show not only invar behavior of a continuous film of FePt but also even negative thermal expansion of FePt nanograins upon equilibrium heating. Yet, both samples exhibit pronounced transient expansion upon laser heating in femtosecond x-ray diffraction experiments. We show that the granular microstructure is essential to support the contractive out-of-plane stresses originating from in-plane expansion via the Poisson effect that add to the uniaxial contractive stress driven by spin disorder. We prove the spin contribution by saturating the magnetic excitations with a first laser pulse and then detecting the purely expansive response to a second pulse. The contractive spin stress is reestablished on the same 100-ps time scale that we observe for the recovery of the ferromagnetic order. Finite-element modeling of the mechanical response of FePt nanosystems confirms the morphology dependence of the dynamics.

Klíčová slova

THERMAL-EXPANSION; ORIGIN

Klíčová slova v angličtině

THERMAL-EXPANSION; ORIGIN

Autoři

VON REPPERT, A.; WILLIG, L.; PUDELL, J.; ZEUSCHNER, S.; SELLGE, G.; GANSS, F.; HELLWIG, O.; ARREGI URIBEETXEBARRIA, J.; UHLÍŘ, V.; CRUT, A.; BARGHEER, M.

Rok RIV

2021

Vydáno

01.06.2020

Nakladatel

AAAS

Místo

WASHINGTON

ISSN

2375-2548

Periodikum

Science Advances

Svazek

6

Číslo

28

Stát

Spojené státy americké

Strany od

1

Strany do

7

Strany počet

7

URL

https://advances.sciencemag.org/content/6/28/eaba1142

Plný text v Digitální knihovně

http://hdl.handle.net/11012/196729

BibTex

@article{BUT165274,
  author="Alexander {von Reppert} and Lisa {Willig} and Jan Etienne {Pudell} and Steffen Peer {Zeuschner} and Gabriel {Sellge} and Fabian {Ganss} and Olaf {Hellwig} and Jon Ander {Arregi Uribeetxebarria} and Vojtěch {Uhlíř} and Aurelien {Crut} and Matias {Bargheer}",
  title="Spin stress contribution to the lattice dynamics of FePt",
  journal="Science Advances",
  year="2020",
  volume="6",
  number="28",
  pages="1--7",
  doi="10.1126/sciadv.aba1142",
  url="https://advances.sciencemag.org/content/6/28/eaba1142"
}