Introduction

Губин, С. П.

doi:10.1002/9783527627561.ch1

Cited by 46 publications

(52 citation statements)

References 126 publications

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“…The magnetic moment distribution of the sample at 330 K and 300 K has been obtained from the experimental magnetization-field data using Equation (2). The fitted curves and their corresponding magnetic moment distributions are depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3

Rostamnejadi

Venkatesan

Salamati

et al. 2017

Journal of Applied Physics

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The static magnetic properties and memory and exchange bias effects have been studied in sol-gel prepared La 0.67 Sr 0.33 MnO 3 (LSMO) nanoparticles. Transmission electron microscopy (TEM) micrographs and static magnetization show log-normal particle and magnetic size distributions with a core-shell structure. Analysis of the magnetization measurements indicates the presence of a magnetic structure with a 7.8 nm core radius and a magnetic dead layer of thickness 1.6 nm in the LSMO nanoparticles, which comprises about 40% of the volume. The disordered spins in the shell freeze at lower temperatures than the core and produce a surface spin glass state exhibiting a weak exchange bias effect. Field cooled and zero-field cooled magnetization measurements have been carried out to study the slow dynamics of the sample and associated magnetic memory effects; the results reveal the superparamagnetic behavior of LSMO nanoparticles described in terms of the magnetic size distribution rather than a superspin glass state. Published by AIP Publishing.

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Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4] In general, the magnetic properties of nanoparticles are strongly influenced by changing their size. The static and dynamic magnetic response of a small single-domain magnetic nanoparticle can be considered equivalent to the response of a single large spin, called a macrospin or superspin.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3

Rostamnejadi

Venkatesan

Salamati

et al. 2017

Journal of Applied Physics

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“…Hyperthermia cancer treatment is possible due to the capabilities of manufactured nanoparticles. With the means of achieving subsingle-magnetic domain particle sizes through various physical and chemical methods [9][10][11][12][13][14], superparamagnetic particles in the form of ferrofluids can be attained. When subjected to a magnetic field whose direction alternates rapidly, ferrofluids can absorb electromagnetic energy, which is readily dissipated to their environment by Brownian (particle rotation) and Néel (moment reorientation) relaxation mechanisms [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetization and Specific Absorption Rate Studies of Ball-Milled Iron Oxide Nanoparticles for Biomedicine

Burnham

Dollahon

et al. 2013

Journal of Nanoparticles

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Comparative studies are presented of iron oxide nanoparticles in the 7-15 nm average diameter range ball milled in hexane in the presence of oleic acid. Transmission electron microscopy identified spherical particles of decreasing size as milling time and/or surfactant concentration increased. Micromagnetic characterization via Mössbauer spectroscopy at room temperature yielded broadened magnetic spectroscopic signatures, while macromagnetic characterization via vibrating sample magnetometry of 7-8 nm diameter particles showed largely superparamagnetic behavior at room temperature and hysteretic at 2 K. Zero-field and field-cooled magnetization curves exhibited a broad maximum at ∼215 K indicating the presence of strong interparticle magnetic interactions. The specific absorption rates of ferrofluids based on these nanoparticle preparations were measured in order to test their efficacies as hyperthermia agents.

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“…We recall that nanoparticle magnetism has many novel applications, particularly in the (applied) area of information storage [167] and in medicine, e.g., in hyperthermia occasioned by induction heating of nanoparticles [168,169] with the dynamic magnetic hysteresis (DMH) induced in nanomagnets by an external ac field constituting a topic of special interest which we now study in the quantum case. Here the temperature directly influences the remagnetization conditions, strongly affecting the effective rates, so altering the loop shape, coercive force, and specific power loss in nanomagnets.…”

Section: Dynamic Magnetic Hysteresismentioning

confidence: 99%