Investigation of magnetic properties of interacting Fe2O3 nanoparticles

Zysler, R.D.; Fiorani, D.; Testa, A. M.

doi:10.1016/s0304-8853(00)01328-7

Cited by 143 publications

(140 citation statements)

References 32 publications

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“…In some systems the virgin curve was observed to go outside the loop for a certain range of fields and temperatures [26,27,28,29,30,31,32]. In some complex magnetic oxides this feature was related with magnetic cation disorder [26,27], which led not only to a spin-glass behavior but also to local structural distortions.…”

Section: The Virgin Magnetization Curvementioning

confidence: 99%

Tailoring the ground state of the ferrimagnet La2Ni(Ni1/3Sb2/3)O6

Franco¹,

Carbonio²,

Kaul³

et al. 2013

Journal of Magnetism and Magnetic Materials

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We report on the magnetic and structural properties of La 2 Ni(Ni 1/3 Sb 2/3 )O 6 in polycrystal, single crystal and thin film samples. We found that this material is a ferrimagnet (T c ≈ 100 K) which possesses a very distinctive and uncommon feature in its virgin curve of the hysteresis loops. We observe that bellow 20 K it lies outside the hysteresis cycle, and this feature was found to be an indication of a microscopically irreversible process possibly involving the interplay of competing antiferromagnetic interactions that hinder the initial movement of domain walls. This initial magnetic state is overcome by applying a temperature dependent characteristic field. Above this field, an isothermal magnetic demagnetization of the samples yield a ground state different from the initial thermally demagnetized one.

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Section: The Virgin Magnetization Curvementioning

confidence: 99%

Tailoring the ground state of the ferrimagnet La2Ni(Ni1/3Sb2/3)O6

Franco¹,

Carbonio²,

Kaul³

et al. 2013

Journal of Magnetism and Magnetic Materials

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“…[6][7][8][9] The influence of the interparticle interactions on magnetic properties was studied by several works. [6][7][8][9][10][11][13][14][15][16][17] The interparticle interactions can increase the media noise and therefore the high-density recording requires the grains to be isolated to minimize the dipolar interactions. Strong dipolar interactions were observed in hematite nanoparticles prepared by different chemical ways.…”

Section: Introductionmentioning

confidence: 99%

“…18 On the contrary, the reduction in the interparticle interactions was observed after the chemical coating of nanoparticles by a nonmagnetic shell 18 or by the loading to the polymer matrix. 10,11,16,17 In this context, we have studied magnetic properties of Fe 2 O 3 @ SiO 2 composite prepared by nanocasting of iron oxide ͑␣-Fe 2 O 3 , hematite͒ in periodic nanoporous SBA-15 silica matrix. The interparticle interactions were investigated using dynamic properties of the system.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Fe2O3 nanoparticles embedded in hollows of periodic nanoporous silica

Zeleňáková

Kováč

Zeleňák

2010

Journal of Applied Physics

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The magnetic properties of the nanocomposite consisting of hematite ͑␣-Fe 2 O 3 ͒ nanoparticles embedded in the hollows of the periodic nanoporous silica matrix were investigated. The magnetic measurements showed on the superparamagnetic behavior of the nanoparticles. This behavior was evidenced by the irreversibility of magnetization curves measured in zero-field-cooled and field cooled regimes, by the presence of a maximum in zero-field-cooled magnetization curve related to blocking temperature T B ϳ 37 K and also by revealing of the coercivity H C below T B . The value of the magnetic moment m P ϳ 300 B of each iron-oxide particle was estimated. The interparticle interactions were investigated from dynamic properties using ac susceptibility. The susceptibility study shows, that the in-phase ac susceptibility Ј is frequency dependent and the peak position increases with the increase in the frequency. The quantitative analysis of Ј using theoretical models shows on the existence of weak dipolar interactions between particles. It was shown from correlation of experimental data with Arrhenius and Vogel-Fulcher laws that the incorporation of the nanoparticles into porous SiO 2 matrix provides the effective method for the reducing of dipolar interactions between magnetic nanoparticles with the size below 10 nm.

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“…Figure 3 shows that all samples present not a superparamagnetic behavior which have been observed by M vs H curves performed at room temperature (no show here). On the other hand, as one can see the FC curves present a saturated state below room temperature to all samples indicating possible interaction effects among nanoalloys [13,14]. Interestingly, the ZFC curves to Co nanoparticles and Mndoped samples show two peaks at 6 and 190 K suggesting that a bimodal size distribution can be present to these samples.…”

Section: Methodsmentioning

confidence: 82%

“…All measurements were obtained by cooling the samples from room temperature to 2 K with an applied field of 50 kOe. Due to the finite sizes of the studied nanoalloys, the saturation magnetization (Ms) values are quite lower than the Co in its bulk form (143 emu/g) and Fe50Co50 alloy in its bulk form, this last generally have values of Ms even greater [13] This indicates that due to the increased number of atoms on the surface (and uncompensated spins) with decreasing size of the nanoparticles the decrease in the Ms is observed [14]. Another interesting feature observed in the hysteresis loops is the decreasing in the coercive field of the samples after insertion of the transition metals in the Co structure.…”

Section: Research Articlementioning

confidence: 96%

Doping Effect on the Magnetic and Structural Properties in Co and Co95TM5 (TM = Fe, Cr and Mn) Nanoparticles

Lima¹,

Pedra²,

Moura³

et al. 2016

Appl. Sci. Lett.

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Co and Co95TM5 (TM = Fe, Cr and Mn) nanoalloys were synthesized by thermal decomposition method of transition metals acetylacetonate in organic solvents. The X-ray diffraction (XRD) results confirm the presence of a competition between cubic and hexagonal phases of the Co metallic. For samples containing 5% of manganese or chromium, we have the presence a small amount of Co in a hexagonal crystal structure in contrast of the Fe-doped sample which present only the cubic phase. Transmission electron microscopy (TEM) image shows that the particles present average size of 5 nm with spherical-like shape. The samples containing 5% of Fe and Cr exhibit a maximum magnetization approximately two times more than the obtained for the pure Co and Mn-doped samples.

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Investigation of magnetic properties of interacting Fe2O3 nanoparticles

Cited by 143 publications

References 32 publications

Tailoring the ground state of the ferrimagnet La2Ni(Ni1/3Sb2/3)O6

Tailoring the ground state of the ferrimagnet La2Ni(Ni1/3Sb2/3)O6

Magnetic properties of Fe2O3 nanoparticles embedded in hollows of periodic nanoporous silica

Doping Effect on the Magnetic and Structural Properties in Co and Co95TM5 (TM = Fe, Cr and Mn) Nanoparticles

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