Influence of surface segregation on magnetic properties of FePt nanoparticles

Journal Article · Mon Sep 23 00:00:00 EDT 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4822172· OSTI ID:22217970

Lv, Hongyan ^[1]; Lei, Yinkai; Datta, Aditi; Wang, Guofeng ^[1]

---

1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261 (United States)

Surface segregation leads to chemical disordering in magnetic alloy nanostructures and thus could have profound impact upon the magnetic properties of these nanostructures. In this study, we used the first-principles density functional theory calculation method to determine how Pt surface segregation (exchanging interior Pt with surface Fe atoms) would affect the magnetic properties of L1{sub 0} ordered FePt nanoparticles. For both cuboid and cuboctahedral FePt nanoparticles, we predicted that the Pt surface segregation process could cause a decrease in total magnetic moments, a change in (easy and/or hard) magnetization axes, and a reduction in magnetic anisotropy.

• OSTI ID: 22217970
• Journal Information: Applied Physics Letters, Vol. 103, Issue 13; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
36 MATERIALS SCIENCE
ANISOTROPY
ATOMS
DENSITY FUNCTIONAL METHOD
IRON ALLOYS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
NANOSTRUCTURES
PLATINUM ALLOYS
REDUCTION
SEGREGATION
SURFACES