Surface anisotropy in maghemite nanoparticles

被引：42
|
作者：
Restrepo, J. [1 ]
Labaye, Y.
Greneche, J. M.
机构：
[1] Univ Antiquia, Grp Estado Solido, Medellin 1226, Colombia
[2] Univ Antiquia, Grp Fis & Astrofis Computac, Medellin 1226, Colombia
[3] Univ Maine, CNRS, UMR 6087, Lab Phys Etat Condense, F-72085 Le Mans, France
来源：
PHYSICA B-CONDENSED MATTER | 2006年 / 384卷 / 1-2期
关键词：
nanoparticles; surface anisotropy; maghemite; Monte Carlo;
D O I：
10.1016/j.physb.2006.05.267
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
In this work we address the effect of surface anisotropy upon the magnetic structure of ferrimagnetic maghemite gamma-Fe2O3 nanoparticles in the limit of low temperatures. Our model is based on a three-dimensional classical Heisenberg-Hamiltonian involving Fe3+ nearest-neighbor interactions, surface and core anisotropies, and a Monte Carlo-Metropolis approach via simulated annealing for energy minimization. Results reveal a marked decrease of the Curie temperature of the considered nanoparticle with that obtained of a bulk maghemite, as well as severe variations with respect to a single domain phenomenology as surface anisotropy increases. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：221 / 223
页数：3
相关论文
共 50 条
  • [21] Magnetic anisotropy of individual maghemite mesocrystals
    Gross, B.
    Philipp, S.
    Josten, E.
    Leliaert, J.
    Wetterskog, E.
    Bergstrom, L.
    Poggio, M.
    PHYSICAL REVIEW B, 2021, 103 (01)
  • [22] Size and surface effects in the magnetic properties of maghemite and magnetite coated nanoparticles
    Ortega, D.
    Velez-Fort, E.
    Garcia, D. A.
    Garcia, R.
    Litran, R.
    Barrera-Solano, C.
    Ramirez-del-Solar, M.
    Dominguez, M.
    PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2010, 368 (1927): : 4407 - 4418
  • [23] Phase and surface area studies of maghemite nanoparticles dispersed in silica gel
    Ang, B. C.
    Yaacob, I. I.
    Wong, Y. H.
    MATERIALS RESEARCH INNOVATIONS, 2014, 18 : 32 - 35
  • [24] Surface charge density of maghemite nanoparticles: Role of electrostatics in the proton exchange
    Lucas, I. T.
    Durand-Vidal, S.
    Dubois, E.
    Chevalet, J.
    Turq, P.
    JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (50): : 18568 - 18576
  • [25] Surface spin disorder and exchange-bias in hollow maghemite nanoparticles
    Khurshid, Hafsa
    Li, Wanfeng
    Manh-Huong Phan
    Mukherjee, Pritish
    Hadjipanayis, George C.
    Srikanth, Hariharan
    APPLIED PHYSICS LETTERS, 2012, 101 (02)
  • [26] Synthesis and application of maghemite nanoparticles for water treatment: response surface method
    Iqbal, Arfa
    Jalees, Muhammad Irfan
    Farooq, Muhammad Umar
    Cevik, Emre
    Mu'azu, Nuhu Dalhat
    DESALINATION AND WATER TREATMENT, 2021, 244 : 212 - 225
  • [27] Evidence of surface anisotropy in magnetic nanoparticles
    Schmool, D. S.
    Rocha, R.
    Sousa, J. B.
    Santos, J. A. M.
    Kakazei, G.
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2006, 300 (01) : E331 - E334
  • [28] Surface energy anisotropy of FePt nanoparticles
    Hong, S
    Yoo, MH
    JOURNAL OF APPLIED PHYSICS, 2005, 97 (08)
  • [29] Surface anisotropy effects in NiO nanoparticles
    Winkler, E
    Zysler, RD
    Mansilla, MV
    Fiorani, D
    PHYSICAL REVIEW B, 2005, 72 (13)
  • [30] Surface contribution to the anisotropy of magnetic nanoparticles
    Garanin, DA
    Kachkachi, H
    PHYSICAL REVIEW LETTERS, 2003, 90 (06)
12345