Kadau, Kai; Gruner, Markus Ernst; Entel, Peter; Kreth, Magnus:
Modeling Structural and Magnetic Phase Transitions in Iron-Nickel Nanoparticles
2003
In: Phase Transitions, Jg. 76 (2003), Heft 4 & 5, S. 355 - 365
Artikel/Aufsatz in Zeitschrift2003Physik
Titel:
Modeling Structural and Magnetic Phase Transitions in Iron-Nickel Nanoparticles
Autor(in):
Kadau, Kai; Gruner, Markus ErnstLSF; Entel, PeterLSF; Kreth, Magnus
Erscheinungsjahr
2003
DOI:
Erschienen in:
Titel:
Phase Transitions
in:
Jg. 76 (2003), Heft 4 & 5, S. 355 - 365

Abstract:

Martensitic phase transformations and magnetovolume effects in iron-nickel alloys are intimately related. The term Invar is widely used to characterize the unusual physical properties accompanying structural and magnetic instabilities such as those observed in the vicinity of the critical composition Fe65Ni35. We discuss the crossover from bulk iron-nickel alloys to nanoparticles with respect to structural and magnetic behavior. By employing molecular-dynamics and Monte Carlo methods, we find the absence of structural instabilities in defect-free particles, a linear scaling of the austenitic transformation temperature with the reciprocal cluster radius, as well as a decrease of the magnetic transition temperature with decreasing particle size.