Detail publikace

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

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.

Klíčová slova

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.

Vydáno

1. 6. 2020

Nakladatel

AAAS

Místo

WASHINGTON

ISSN

2375-2548

Periodikum

Science Advances

Ročník

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",
  issn="2375-2548",
  url="https://advances.sciencemag.org/content/6/28/eaba1142"
}