High-temperature magnetization and Mössbauer spectra of nanoparticles in a weak magnetic field

Mikhail A Chuev

doi:10.1117/12.854226

26 February 2010 High-temperature magnetization and Mössbauer spectra of nanoparticles in a weak magnetic field

Mikhail A Chuev

Proceedings Volume 7521, International Conference on Micro- and Nano-Electronics 2009; 75210P (2010) https://doi.org/10.1117/12.854226
Event: International Conference on Micro- and Nano-Electronics 2009, 2009, Zvenigorod, Russian Federation

Abstract

High-temperature magnetic effects observed in the conventional 'low-frequency' magnetization measurements and Mössbauer spectra of nanoparticles are discussed in the framework of a general model for magnetic dynamics of ensemble of single-domain particles in which the uniform magnetization precession orbits are considered as stochastic states. Qualitative analysis and numerical calculations within the 'multilevel' model evidence for the existence of the asymptotic high-temperature behavior of the magnetization of an ensemble of particles in a weak magnetic field, which is earlier predicted to be different from the classical Langevin limit for ideal superparamagnetic particles. Based on this approach, a simplified three-level stochastic model is developed in order to describe the Mössbauer absorption spectra of an ensemble of magnetic nanoparticles in a weak magnetic field. In particular, this model predicts the appearance of ⁵⁷Fe magnetic sextets with a small hyperfine splitting in a weak magnetic field and at high temperature, which look like effective "doublets" of lines often observed in experimental spectra.

Citation Download Citation

Mikhail A Chuev "High-temperature magnetization and Mössbauer spectra of nanoparticles in a weak magnetic field", Proc. SPIE 7521, International Conference on Micro- and Nano-Electronics 2009, 75210P (26 February 2010); https://doi.org/10.1117/12.854226

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available