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Determination of Blocking Temperature in Magnetization and Mössbauer Time Scale: A Functional Form Approach
Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0,700, I-09042 Monserrato, CA, Italy..
Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0,700, I-09042 Monserrato, CA, Italy..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Vinca Inst Nucl Sci, POB 522, Belgrade 11001, Serbia.;CNR, Ist Struttura Mat, I-00015 Monterotondo, RM, Italy..
2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, no 30, 16541-16548 p.Article in journal (Refereed) Published
Abstract [en]

We studied the temperature dependence of the magnetization in an ensemble of monodomain nanoparticles both with dc magnetometry and Mössbauer spectroscopy. The analytical form of the temperature dependence is given by the complementary cumulative distribution function. This allows to determine the magnetization blocking temperatures of the sample by a fitting procedure. It is possible to calculate the Mössbauer blocking temperature by a single spectrum and the dc magnetization blocking temperature by two points of the thermoremanent magnetization curve, thus with a large reduction of the experimental work. The method may be used for particles with not too strong interactions, such happens in the Fe28 sample and not for samples with strong interactions as N30; it may be used for interparticle interaction energies up to 2 yJ and not for energies larger than 60 yJ. This method of analysis of the data should be used in the future work concerning the thermoremanent magnetization and Mössbauer spectra of magnetic nanoparticles.

Place, publisher, year, edition, pages
2017. Vol. 121, no 30, 16541-16548 p.
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-332670DOI: 10.1021/acs.jpcc.7b01748ISI: 000407189400050OAI: oai:DiVA.org:uu-332670DiVA: diva2:1153787
Available from: 2017-10-31 Created: 2017-10-31 Last updated: 2017-10-31Bibliographically approved

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Muscas, Giuseppe

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