Thermal behavior of hard-axis magnetization in noninteracting particles with uniaxial anisotropy

Ilievski, F.; Cuchillo, A.; Nunes, W.; Knobel, M.; Ross, C. A.; Vargas, P.
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p202503
Academic Journal
Experimental evidence is presented to support predictions made by an analytical model describing the temperature-dependent behavior of an assembly of noninteracting magnetic nanoparticles with uniaxial anisotropy under an external field. When the applied field is smaller than the anisotropy field of the particles and is oriented perpendicular to the easy axis, a maximum of the magnetization occurs at finite temperature. The theory shows good agreement with measurements of an array of CoCrPt nanoislands with uniaxial anisotropy. Deviations are discussed taking into account the thermal dependencies of the saturation magnetization and the anisotropy of the magnetic material.


Related Articles

  • Ferromagnetic resonance in systems with competing uniaxial and cubic anisotropies. Kachkachi, H.; Schmool, D. S. // European Physical Journal B -- Condensed Matter;Mar2007, Vol. 56 Issue 1, p27 

    We develop a model for ferromagnetic resonance in systems with competing uniaxial and cubic anisotropies. This model applies to (i) magnetic materials with both uniaxial and cubic anisotropies, and (ii) magnetic nanoparticles with effective core and surface anisotropies; We numerically compute...

  • Effects of interaction of nanoparticles in a highly anisotropic ferrimagnet. Ol'khovik, L. P.; Sizova, Z. I.; Shurinova, E. V.; Kamzin, A. S. // Physics of the Solid State;Feb2010, Vol. 52 Issue 2, p311 

    This paper reports on a study of the field and temperature dependences of the parameters of the particle magnetic interaction in a densely packed system of nanocrystals of the highly anisotropic hexagonal ferrite BaFe12O19 with the particles distributed in diameter within the range 10—100...

  • Surface and interface effects in magnetic core–shell nanoparticles. Evans, R.F.L.; Chantrell, R.W.; Chubykalo-Fesenko, O. // MRS Bulletin;Nov2013, Vol. 38 Issue 11, p909 

    Using computational modeling, we describe and explain the effects resulting from surfaces and interfaces in core–shell nanoparticles. We outline the basis of the atomistic spin model, which is used to simulate the equilibrium and dynamic magnetic properties of magnetic nanoparticles. The...

  • Prediction method of flux loss in anisotropic NdFeB/SmFeN hybrid magnets. Hirotoshi Fukunaga; Hiroki Murata; Takeshi Yanai; Masaki Nakano; Fumitoshi Yamashita // Journal of Applied Physics;May2010, Vol. 107 Issue 9, p09A736-1 

    We systematically evaluated the initial flux loss of anisotropic HDDR-NdFeB/RD-SmFeN hybrid bonded magnets. The measured flux loss values were compared with those obtained by two prediction methods based on our previous proposal. Consequently, it was clarified that the initial flux loss of...

  • Effect of Partial Orientation in [100] Direction on the Magnetic Properties of Co-Ferrite Prepared from Nano Particles. El-Sayed, H. M. // American Journal of Applied Sciences;2009, Vol. 6 Issue 1, p43 

    Chemical co-precipitation method was used for the preparation of Co-ferrite nano particles. The particle size was about 18 nm. A magnetic anisotropy of Co-ferrite could be increased by applying an external magnetic field during the pressing of the nano particles before the final sintering. This...

  • Surface and exchange anisotropy fields in MnFe...O... nanoparticles: Size and temperature effects. Bakuzis, A. F.; Morais, P. C. // Journal of Applied Physics;5/15/1999, Vol. 85 Issue 10, p7480 

    Presents information on a study which investigated the surface and exchange anisotropy field in spherical manganese ferrite magnetic nanoparticles using angular measurement of magnetic resonance. Angular measurement of magnetic resonance; Results; Conclusions;

  • Role of anisotropy and interactions in magnetic nanoparticle systems. Malik, R.; Lamba, S.; Kotnala, R. K.; Annapoorni, S. // European Physical Journal B -- Condensed Matter;Mar2010, Vol. 74 Issue 1, p75 

    Magnetic nanoparticle systems are characterized by several competing effects like anisotropy, an inherent disorder, the long range dipolar and the short range exchange interactions due to clustering effects. The sensitivity of the observed static and dynamical properties of these systems like...

  • Approach to saturation in nanomagnetic systems: Easy axis distribution and interactions. Iglesias, R.; Rubio, H. // Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1246 

    Using the applied field angle dependence of the approach to saturation of the magnetization, a theory for the determination of the distribution of easy axes of anisotropy and the ratio between interaction and anisotropy in bidimensional nanomagnetic materials is proposed. The usual saturation...

  • Domain Walls in Magnetic Multilayers with a Biquadratic Exchange. Kostyuchenko, V. V. // Physics of the Solid State;Jan2002, Vol. 44 Issue 1, p98 

    The structure of domain walls in magnetic multilayers is investigated taking into account the uniaxial anisotropy and biquadratic exchange between the layers. Analytical solutions are derived for different types of domain wall structures. The majority of the solutions obtained have no analogs in...


Read the Article


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

Try another library?
Sign out of this library

Other Topics