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Tsoi, G. M.; Wenger, L. E.; Senaratne, U.; Tackett, Ronald; Buc, E. C.; Naik, R.; Vaishnava, P. P.; Naik, V. M.

doi:10.1103/physrevb.72.014445

Cited by 70 publications

(75 citation statements)

References 19 publications

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“…5,[32][33][34] The ZFC memory effect has only been measured in spin glass systems. 5,33 The FC memory effect observed in LSMO nanoparticles is mainly due to the magnetic size distribution, which we have observed in the log-normal distribution of the magnetic moment in the M-H measurements above the blocking temperature. The surface spin glass state may also contribute to the FC memory effect, but it is too weak to be seen in the ZFC memory effect.…”

Section: Resultsmentioning

confidence: 99%

“…5,12,32,33 To investigate their influence on the FC memory effect, LSMO nanoparticles have been diluted by mixing them with icing sugar with a 1.3/30.6 mg weight ratio. Then, the second protocol has been employed on the LSMO/icing sugar mixture with different waiting times of 0.1, 0.2, 0.3, 1, and 2 h at 50 K. The measured magnetization during the different waiting periods is shown 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%

Section: Resultsmentioning

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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“…We will perform a series of heating/cooling processes which were earlier discussed in the case of ferromagnetic nanoparticles. 19,[22][23][24] We will also discuss the memory effects and aging effects throughly. The organization of this paper is as follows.…”

Section: Mishra and Subrahmanayammentioning

confidence: 99%

“…50,51 Recently it has gained a lot of attention in the system of nanoparticles, where slow dynamics study becomes important to characterize both the superspin glass behavior and the superparamagnetism. 9,18,20,22,23 Most of the experiments are performed by measurement of time-dependent ZFC and TRM magnetizations. In a TRM protocol the system is cooled in a field to a base temperature T base below blocking temperature T B .…”

Section: Aging Effectmentioning

confidence: 99%

“…35 The aging and memory effects are the two aspects that have been studied extensively in recent years, however mostly for the case of ferromagnetic particles. [7][8][9]16,[18][19][20][21][22][23][24][25][26][27] In this paper our aim is to investigate these effects for collection of a few antiferromagnetic nanoparticles (AFNs) which has received relatively lesser attention.…”

Section: Introductionmentioning

confidence: 99%

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Memory and aging effects in antiferromagnetic nanoparticles

Mishra

2010

Eur. Phys. J. B

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We investigate slow dynamics of collection of a few antiferromagnetic NiO nanoparticles. The zero-field cooled magnetization exhibits size dependent fluctuations. We find memory effects in field cooled magnetization, as well as aging effects in thermoremenant magnetization of antiferromagnetic nanoparticles. The antiferromagnetic nanoparticles show a stronger memory effect than the corresponding effect in the ferromagnetic particles, when the distribution of particles include very small sizes. The situation reverses for bigger sizes. The relaxation of the magnetization after a sudden cooling, heating and removal of fields reiterate the memory effects. We also see a weak signature of size-dependent magnetization fluctuations in aging effect of antiferromagnetic nanoparticles. We find a two-step relaxation of thermoremenant magnetization in antiferromagnetic case, which differs qualitatively from relaxation of ferromagnetic nanoparticles.

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