Magneto-optical study of magnetite nanoparticles prepared by chemical and biomineralization process

Džarová, A.; Τimko, M.; Jamon, Damien; Kopčanský, P.; Kováč, J.; Choueikani, Fadi; Gojżewski, Hubert; Rousseau, Jean‐Jacques

doi:10.1016/j.jmmm.2010.12.041

Cited by 18 publications

(13 citation statements)

References 21 publications

(29 reference statements)

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“…These behaviors of the weak coercivity and the remanence near 0.5 prove that the Co particles can still be in ferromagnetic nature at room temperature with an essential single domain form and are randomly dispersed. Both coercivity and ratio ( / ) = 0.5 (theoretically) are signature/evidence for a random dispersion of noninteracting single domain particles but in weakly blocked state of particle magnetization [1,39]. For granular metal systems, there exists a so-called percolation threshold ( ) of the volume fraction at which the first continuous metal particle is formed [1,40].…”

Section: Resultsmentioning

confidence: 99%

Structural Characteristics and Magnetic Properties of Al₂O₃ Matrix-Based Co-Cermet Nanogranular Films

Cuong

Tuấn

Anh

et al. 2015

Journal of Materials

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Magnetic micro-and nanogranular materials prepared by different methods have been used widely in studies of magnetooptical response. However, among them there seems to be nothing about magnetic nanogranular thin films prepared by a cosputtering technique for both metals and insulators till now. This paper presented and discussed preparation, structural characteristics, and magnetic properties of alumina (Al 2 O 3 ) matrix-based granular Co-cermet thin films deposited by means of the cosputtering technique for both Co and Al 2 O 3 . By varying the ferromagnetic (Co) atomic fraction, , from 0.04 to 0.63, several dominant features of deposition for these thin films were shown. Structural characteristics by X-ray diffraction confirmed a cermet-type structure for these films. Furthermore, magnetic behaviours presented a transition from paramagnetic-to superparamagnetic-and then to ferromagnetic-like properties, indicating agglomeration and growth following Co components of Co clusters or nanoparticles. These results show a typical granular Co-cermet feature for the Co-Al 2 O 3 thin films prepared, in which Co magnetic nanogranules are dispersed in a ceramic matrix. Such nanomaterials can be applied suitably for our investigations in future on the magnetooptical responses of spinplasmonics.

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Section: Resultsmentioning

confidence: 99%

Structural Characteristics and Magnetic Properties of Al₂O₃ Matrix-Based Co-Cermet Nanogranular Films

Cuong

Tuấn

Anh

et al. 2015

Journal of Materials

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“…After passing another polarizer and prism, the intensity of transmitted light was recorded by a photodetector (Thor LABS PDA36A 350–1100 nm) connected to the multimeter and subsequently registered by a computer monitoring the light intensity as a function of magnetic or electric field, alternatively time. The scheme of experimental configuration has already been described [ 26 , 29 ]. The light transmission was expressed in the case of parallel polarizers as I / I 0 , here I 0 and I are the intensity of incident light passing through the LC cell without applied field and under the field, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…In some previous works [ 27 , 28 , 29 ] the effect of various types of magnetic nanoparticles with respect to their shape, i.e., nearly spherical, chains of magnetosomes from magnetotactical bacteria and rod like nanoparticles, on the behavior of nematic LCs in magnetic field, including magnetic Freedericksz transition and light transmission was studied. It was shown that the shape and size of nanoparticles has significant influence on the interaction between particles and molecules of LC and by that on structural transitions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Liquid Crystalline Host on Structural Changes in Magnetosomes Based Ferronematics

et al. 2021

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The effect of the liquid crystalline host on structural changes in magnetosomes based on ferronematics is studied using the surface acoustic wave (SAW) technique supported by some capacitance and light transmission measurements. The measurement of the attenuation response of SAW propagating along the interface between LC and the piezoelectric substrate is used to study processes of structural changes under magnetic field. The magnetosome nanoparticles of the same volume concentration were added to three different nematic LCs, 5CB, 6CB, and E7. Unlike to undoped LCs, the different responses of SAW attenuation under the influence of magnetic and electric fields in LCs doped with magnetosomes were observed due to characteristic structural changes. The decrease of the threshold field for doped LCs as compared with pure LCs and slight effects on structural changes were registered. The threshold magnetic fields of LCs and composites were determined from capacitance measurements, and the slight shift to lower values was registered for doped LCs. The shift of nematic-isotropic transition was registered from dependencies of SAW attenuation on temperature. The acoustic anisotropy measurement approved the previous supposition about the role of bulk viscosity in used SAW measurements. In addition, capacitance and light transmition investigations supported SAW results and pointed out conclusions about their magnetic field behavior. Obtained results are discussed and confronted with previous ones and coincide well with those observed using acoustic, optical, or dielectric techniques.

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“…The detailed description of the cultivation process of the bacteria is given in (Dzarova et al, 2011). The process of isolation of magnetosome chains from the body of bacteria consists of a series of cycles of sonication, centrifugation, and magnetic decantation.…”

Section: Preparation Of Magnetosomesmentioning

confidence: 99%

The Effect of Sonication on Acoustic Properties of Biogenic Ferroparticle Suspension

Józefczak

Hornowski

Król

et al. 2016

Archives of Acoustics

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Superparamagnetic iron oxide nanoparticles (SPION) synthesised chemically usually need the modification of the particle surface. Other natural sources of magnetic particles are various magnetotactic bacteria. Magnetosomes isolated from magnetotactic bacteria are organelles consisting of magnetite (Fe3O4) or greigite (Fe3S4) crystals enclosed by a biological membrane. Magnetotactic bacteria produce their magnetic particles in chains. The process of isolation of magnetosome chains from the body of bacteria consists of a series of cycles of centrifugation and magnetic decantation. Using a high-energy ultrasound it is possible to break the magnetosome chains into individual nanoparticles -magnetosomes. This study presents the effect of sonication of magnetosome suspension on their acoustic properties, that is speed and attenuation of the sound. Acoustic propagation parameters are measured using ultrasonic spectroscopy based on FFT spectral analysis of the received pulses. The speed and attenuation of ultrasonic waves in magnetosome suspensions are analysed as a function of frequency, temperature, magnetic field intensity, and the angle between the direction of the wave and the direction of the field.

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Magneto-optical study of magnetite nanoparticles prepared by chemical and biomineralization process

Cited by 18 publications

References 21 publications

Structural Characteristics and Magnetic Properties of Al₂O₃ Matrix-Based Co-Cermet Nanogranular Films

Structural Characteristics and Magnetic Properties of Al₂O₃ Matrix-Based Co-Cermet Nanogranular Films

Effect of Liquid Crystalline Host on Structural Changes in Magnetosomes Based Ferronematics

The Effect of Sonication on Acoustic Properties of Biogenic Ferroparticle Suspension

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Magneto-optical study of magnetite nanoparticles prepared by chemical and biomineralization process

Cited by 18 publications

References 21 publications

Structural Characteristics and Magnetic Properties of Al2O3 Matrix-Based Co-Cermet Nanogranular Films

Structural Characteristics and Magnetic Properties of Al2O3 Matrix-Based Co-Cermet Nanogranular Films

Effect of Liquid Crystalline Host on Structural Changes in Magnetosomes Based Ferronematics

The Effect of Sonication on Acoustic Properties of Biogenic Ferroparticle Suspension

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Structural Characteristics and Magnetic Properties of Al₂O₃ Matrix-Based Co-Cermet Nanogranular Films

Structural Characteristics and Magnetic Properties of Al₂O₃ Matrix-Based Co-Cermet Nanogranular Films