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Magnetic Configuration and Relaxation in Iron Based Nano-Particles: A Mössbauer Approach

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Trends in Nanophysics

Part of the book series: Engineering Materials ((ENG.MAT.))

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Abstract

The difficulty to stabilize a definite crystalline structure or phase, due to a large gradient of defects along the particle diameter, is unfortunately specific to particles of nanometer size. Therefore, atypical spin configurations and magnetic anisotropies as well as enhanced magnetic relaxations via thermal excitations are expected in systems of fine nano-particles. The actual work reports on various possibilities for a comprehensive characterization of the magnetic configuration and magnetic relaxation mechanisms of nano-particles, by corroborating the powerful method of Mössbauer spectroscopy with complementary magnetic and structural techniques. The capabilities of temperature and field dependent Mössbauer spectroscopy to provide valuable information about spin blocking temperatures, effective anisotropy constants, amount of uncompensated spins inside of particle and magnetic phase composition are critically discussed for both powder like systems and nano-particles dispersed in different solvents.

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Acknowledgments

The authors wish to thank Ministry of Education and Research for financial support by national program PN2 71-083 and by core program PN09450103.

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Authors and Affiliations

  1. National Institute for Materials Physics (INFM), 105 Atomistilor Street, Magurele-Bucharest, 077125, Romania

    V. Kuncser, G. Schinteie & G. Filoti

  2. National Institute for Lasers, Plasma and Radiation Physics (INFLPR), 409 Atomistilor St., Bucharest-Magurele, 077125, Romania

    R. Alexandrescu & I. Morjan

  3. Romanian Academy-Timisoara Division, Centre of Fundamental and Advanced Technical Research, Timisoara, Romania

    L. Vekas

Authors
  1. V. Kuncser
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  2. G. Schinteie
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  3. R. Alexandrescu
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  4. I. Morjan
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  5. L. Vekas
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  6. G. Filoti
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Corresponding author

Correspondence to V. Kuncser .

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Editors and Affiliations

  1. Physics (INFIM), National Institute of Materials, Atomistilor St. 105, Bucuresti, 077125, Romania

    Victor Bârsan

  2. Physics (INFIM), National Institute of Materials, Atomistilor St. 105, Bucuresti, 077125, Romania

    Alexandru Aldea

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Kuncser, V., Schinteie, G., Alexandrescu, R., Morjan, I., Vekas, L., Filoti, G. (2010). Magnetic Configuration and Relaxation in Iron Based Nano-Particles: A Mössbauer Approach. In: Bârsan, V., Aldea, A. (eds) Trends in Nanophysics. Engineering Materials. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12070-1_13

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