O Šipr et al 2007 J. Phys.: Condens. Matter 19 446205 doi:10.1088/0953-8984/19/44/446205
Influence of temperature on the systematics of magnetic moments of free Fe clusters
O Šipr1, S Polesya2, J Minár2 and H Ebert2
Show affiliationsWe investigate how temperature affects the dependence of the average magnetic moments 
of clusters on their size and how the magnetic moment profile of an individual cluster varies with temperature T. The focus is on free spherical Fe clusters of 9–89 atoms. The interaction among individual magnetic moments is described by a classical Heisenberg spin Hamiltonian, with exchange coupling constants provided by ab initio calculations. Average magnetic moments for finite T were obtained via Monte Carlo simulations. We found that the exchange coupling depends on the cluster size and on the position of the atom in the cluster in a complex way, with no obvious systematics. The magnetic moment profile of an individual cluster becomes more uniform if T increases. The dependence of on the cluster size, in practice, does not depend on temperature if T is in the range of 0–300 K. Ground-state calculations for T = 0 K should thus be able to describe experiments based on the deflection of a molecular beam in a magnet for 
K.
- PACS
-
75.30.Cr Saturation moments and magnetic susceptibilities
75.10.Dg Crystal-field theory and spin Hamiltonians
- Subjects
- Dates
-
Issue 44 (7 November 2007)
Received 27 April 2007, in final form 5 September 2007
Published 16 October 2007
-
Influence of temperature on the systematics of magnetic moments of free Fe clusters
O Šipr et al 2007 J. Phys.: Condens. Matter 19 446205
-
Electronic, magnetic and transport properties of rare-earth monopnictides
Chun-Gang Duan et al 2007 J. Phys.: Condens. Matter 19 315220
-
A new triangular system: NaxCoO2
Masao Ogata 2007 J. Phys.: Condens. Matter 19 145282
-
Via hexagons to squares in ferrofluids: experiments on hysteretic surface transformations under variation of the normal magnetic field
C Gollwitzer et al 2006 J. Phys.: Condens. Matter 18 S2643
-
Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis
B J Powell 2006 J. Phys.: Condens. Matter 18 L575
-
Stick boundary conditions and rotational velocity auto-correlation functions for colloidal particles in a coarse-grained representation of the solvent
J T Padding et al 2005 J. Phys.: Condens. Matter 17 S3393
-
Field-induced effects of anisotropic magnetic interactions in SrCu2(BO3)2
K Kodama et al 2005 J. Phys.: Condens. Matter 17 L61
-
Specific interaction of polymers with surface defects: structure formation of polycarbonate on nickel
L Delle Site et al 2005 J. Phys.: Condens. Matter 17 L53
-
Theory of gap-node detection by angle-resolved specific heat measurement
P Miranović et al 2005 J. Phys.: Condens. Matter 17 7971
-
Cluster coherent potential approximation for the electronic structure of disordered alloys
M S Laad and L Craco 2005 J. Phys.: Condens. Matter 17 4765
Related review articles
What's this?- Magnetocaloric effect and its relation to shape-memory properties in ferromagnetic Heusler alloys
- Itinerant helimagnet MnSi
- Surface spin-flop transition in an antiferromagnet