TITLE

Size dependence, nucleation, and phase transformation of FePt nanoparticles

AUTHOR(S)
Yi Ding; Majetich, Sara A.
PUB. DATE
July 2005
SOURCE
Applied Physics Letters;7/11/2005, Vol. 87 Issue 2, p022508
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Monolayers of chemically prepared FePt nanoparticles were deposited on silicon nitride membrane windows, and annealed under different conditions. Hysteresis loops showed a bimodal distribution of switching fields. The size dependence determined from transmission electron microscopy was correlated with the magnetic switching field distribution, assuming that all particles above a threshold size d* had high anisotropy. This simplified model yielded a common value of d*, independent of the annealing conditions. The dependence of d* on the initial particle size indicated the importance of grain boundaries as nucleation sites, and supports the hypothesis that the fcc-to-fct phase transformation is kinetically limited.
ACCESSION #
18008176

 

Related Articles

  • Synthesis of DNA templated trifunctional electrically conducting, optical, and magnetic nanochain of Nicore–Aushell for biodevice. Mandal, Madhuri; Mandal, Kalyan // Journal of Applied Physics;Jul2009, Vol. 106 Issue 2, p026101 

    Synthesis of trifunctional, e.g., electrically conducting, optical, and magnetic nanochains of Nicore–Aushell, has been discussed here. Properties of the materials were investigated from the view of its application in bionanodevice. Our investigation indicates that such material attached...

  • Studies of switching field and thermal energy barrier distributions in a FePt nanoparticle system. Wu, X. W.; Zhou, H.; van de Veerdonk, R. J. M.; Klemmer, T. J.; Liu, C.; Shukla, N.; Weller, D.; Tanase, M.; Laughlin, D. E. // Journal of Applied Physics;5/15/2003, Vol. 93 Issue 10, p7181 

    Dynamic remanent hysteresis loops were measured at several time scales for a L1[SUB0] ordered Fe[SUB45]Pt[SUB55] nanoparticle array sample. At a fixed percentage of magnetization switched, Sharrock's formula was applied to obtain both the thermal stability factor and the intrinsic switching...

  • Room temperature magnetism in Ni-doped CdSe nanoparticles. Kumar, Sunil; Kumar, Sanjeev; Verma, N. K.; Chakarvarti, S. K. // Journal of Materials Science: Materials in Electronics;Aug2011, Vol. 22 Issue 8, p901 

    Room temperature ferro-magnetism in Ni-doped CdSe nanoparticles (NPs) synthesized by a wet chemical precipitation method is reported. Transmission electron microscopy shows that the average particle size of Ni-doped CdSe NPs is about 8 nm. X-ray diffraction shows the zinc blende (cubic)...

  • Synthesis of Superparamagnetic NiZnFeO Nanoparticles Using a Microwave-Assisted Combustion Method. Kothawale, Manoj; Tangsali, R.; Naik, G.; Budkuley, J. // Journal of Superconductivity & Novel Magnetism;Aug2015, Vol. 28 Issue 8, p2461 

    The powder of Ni Zn Fe O nanoparticles is synthesized using a microwave-assisted combustion method. X-ray diffraction and IR spectrum analysis show that the sample has a single-phase spinel structure. Debye-Scherrer formula reveals a crystallize size of 49 nm ±5 %, whereas transmission...

  • Surface-anisotropy and training effects of exchange bias in nanoparticles with inverted ferromagnetic-antiferromagnetic core-shell morphology. Hu, Yong; Du, An // Journal of Applied Physics;Aug2011, Vol. 110 Issue 3, p033908 

    A modified Monte Carlo method using the Metropolis algorithm is performed to simulate the hysteresis behaviors of the nanoparticles with an inverted antiferromagnetic (core)/ferromagnetic (shell) morphology at low temperature after field cooling. We have examined the dependence of exchange bias...

  • Origin of peak effect in the magnetization hysteresis loop of melt-processed.... Viswanath, N.V.N.; Rajasekharan, T. // Applied Physics Letters;12/29/1997, Vol. 71 Issue 26, p3895 

    Investigates the origin of peak effect in the magnetization hysteresis loop in melt-processed superconductors using transmission electron microscopy. Contribution of the ortho-II structure on flux pinning; Correlation between the spinodal decomposition and peak effect; Elimination of peak...

  • Stable canted magnetization in Co thin films on highly oriented pyrolytic graphite induced by template defects. Lin, Wen-Chin; Huang, Ya-Yun; Ho, Tsung-Ying; Wang, Chih-Hsiung // Applied Physics Letters;10/24/2011, Vol. 99 Issue 17, p172502 

    Co thin films were grown on planar highly oriented pyrolytic graphite (p-HOPG) and Ar+ sputtered HOPG (s-HOPG) for comparison. Measurement of Auger ratio Co/C suggested the more uniform nucleation for Co on s-HOPG. Co/p-HOPG exhibited only in-plane magnetization, whereas Co/s-HOPG revealed the...

  • Self-Assembled Monolayer of Mixed Gold and Nickel Nanoparticles. Yanni Jie; Huiqing Fan; Wei You // Nano-Micro Letters;2012, Vol. 4 Issue 3, p166 

    Forming a monolayer of mixed nickel and gold nanoparticles through self-assembly via simple solution processing constitutes an important step toward inexpensive nanoparticle-based carbon nanofiber growth. In this work, mixed gold and nickel nanoparticles were anchored on the silicon wafer using...

  • Phase transformation of alumina-coated FePt nanoparticles. Johnston-Peck, Aaron C.; Tracy, Joseph B. // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07B522 

    Monolayers of FePt nanoparticles (NPs) were coated with 10 nm-thick layers of Al2O3 by pulsed laser deposition (PLD). The Al2O3 coating prevents diffusion and stabilizes the NP monolayer against sintering. Annealing converts the FePt NPs from an alloy phase (A1) into intermetallic phases. Atomic...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics