A Simple Model for Amorphous and Liquid Ferromagnets

Handrich, K.

doi:10.1002/pssb.19690320166

Cited by 301 publications

(70 citation statements)

References 2 publications

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“…This variation of HI is also displayed in figure I. A further estimate of the Curie point of the amorphous phase has been inferred by a least squares fitting analysis of the temperature dependence of the mean hyperfine field Bhf for the amorphous phase, obtained from the Mossbauer spectra, using the model of Handrich [9]. This is displayed in figure 2.…”

Section: And Discussionmentioning

confidence: 77%

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe₈₉Zr₇B₃Cu₁

et al. 2002

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The technique of small angle neutron scattering (SANS) is ideally suited for determining the length scale of magnetic correlations in nanocrystalline materials. The additional use of polarized neutrons also allows for a clear separation between magnetic and non-magnetic scattering. The temperature dependence of the SANS cross-section from a two-phase alloy, consisting of both amorphous and nano-crystalline parts, Fe 89 Zr 7 B 3 Ctu,, has been measured in the temperature range from 293 to 500 K. The SANS measurements are accompanied by bulk magnetization and Mbssbauer transmission data. In this range of temperatures, the magnetic contrast between the nanocrystalline and amorphous phases, which are both magnetic, changes dramatically. This phase contrast increases up to 380 K, which is the proposed decoupling temperature for the inter-granular exchange stiffness. Above this temperature, the contrast levels off slowly, being totally dominated by the decreasing magnetization of the nanocrystalline phase.

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Section: And Discussionmentioning

confidence: 77%

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe₈₉Zr₇B₃Cu₁

et al. 2002

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“…The energy barriers K. V for the flipping of the particle magnetization are 6.5-7.5 x 10-15erg for samples thicker than --10 000 A in the temperature range up to -0.9 TN. 4. Discussion.…”

Section: Low Temperature Phasesmentioning

confidence: 91%

“…The comparison of the normalized magnetization curve (Fig. 3a) of the condensed phases of FeCI, with those of the non-crystalline ferrous halides [2] again show a significant difference : Due to fluctuations in the local exchange integrals [3,4] resp. in the anisotropy fields [5] a considerably less steep rise of the hf field below the magnetic ordering temperature is characteristic for amorphous magnets.…”

Section: Low Temperature Phasesmentioning

confidence: 92%

“…-I t has been shown that the condensation of ferrous halides from a molecular beam onto a helium-cooled substrate leads to the formation of a non-crystalline phase [I]. The magnetic properties of these samples as studied with the Mossbauer effect [2], are markedly different from those of the crystalline compounds and have been discussed within the framework of published theories of amorphous magnetism [3,4,51. The present paper discusses Mossbauer spectroscopic investigations of FeC1, samples prepared in a similar manner from a molecular beam.…”

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confidence: 99%

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LOW TEMPERATURE PHASES OF MICROCRYSTALLINE FeCl₃

1974

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Rbsum6. -Les spectres Mossbauer de FeC13 dtposB a basse temperature a partir de la vapeur montrent deux doublets quadrupolaires au-dessus de 6,5 K et des eclatements magnetiques hyperfins en dessous de 6,5 K. Par chauffage a 300 K, les Bchantillons peuvent &tre transformes irrkversiblement en l'ttat cristallin normal. En dessous de leurs temperatures de transition magnktique, les spectres des phases trempQs a partir de la vapeur ainsi que ceux de la phase cristalline normale montrent des effets de relaxation qui sont attribues i des fluctuations superparamagnktiques. Par opposition aux halogenures ferreux amorphes, les courbes d'aimantation des phases de FeC13 trempees a partir de la vapeur ont la mEme dkpendance fonctionnelle que la phase cristalline. On suggere que la dkposition de FeCl, a basse temperature conduit a des structures microcristallines plut6t qu'amorphes.Abstract. -Mossbauer spectra of FeC13, vapour deposited at low temperatures, show two quadrupole doublets above 6.5 K and magnetic hyperfine splittings below 6.5 K. Upon heating to 300 K the samples can be transformed irreversibly to the normal crystalline phase. Below their magnetic transition temperatures the spectra of both vapour quenched phases and of the normal crystalline phase exhibit relaxation effects which are interpreted as superparamagnetic fluctuations. In contrast to the amorphous ferrous halides, the magnetization curves of the vapour quenched phases of FeC13 show the same functional dependence as the crystalline phase. It is suggested that the low temperature deposition of FeC13 leads to microcrystalline rather than to amorphous structures.

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“…[14,21] The magnetization curves ( Figure 5) demonstrate that they are superparamagnetic, [9,13] No pure liquids with ferromagnetism have been found until now, even though this could be achieved theoretically. [23,24] Magnetic materials have a higher melting temperature than their Curie point, thus they lose their ferromagnetism properties when melted. Therefore, ferrofluids, which www.chemeurj.org are composed of magnetic NCs, surfactants and working fluids, have been widely developed to meet the requirement of liquid magnetic materials.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Ferrite Nanocrystals Stabilized by Ionic‐Liquid Molecules through a Thermal Decomposition Route

Wang

Song

Zhang

2010

Chemistry A European J

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A series of M(x) Fe(3-x) O(4) (M=Fe, Co, Ni, Zn; 0≤x≤1) ferrite nanocrystals stabilized by ionic-liquid molecules have been successfully synthesized through a thermal decomposition route. Instead of the widely used long-chain lipid surfactants and high-boiling solvents, the ionic-liquid molecules not only played the role of surfactants, but also served as reaction and dispersion media simultaneously in the preparation of ferrite nanocrystals. Due to their good fluidity under magnetic fields and high ionic conductivity, the ionic-liquid molecules and M(x) Fe(3-x) O(4) ferrite nanocrystal-based conducting ferrofluids were successfully used as electrolytes in an AC circuit. The open or closed state of the circuit was directly controlled by moving a permanent magnet so as to tune the position of the ferrofluids, and consequently, resulted in the "off" or "on" state of the four indicative yellow-light-emitting diodes. These results demonstrate that the conducting ferrofluids successfully play the role of "magnetic switch".

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A Simple Model for Amorphous and Liquid Ferromagnets

Cited by 301 publications

References 2 publications

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe₈₉Zr₇B₃Cu₁

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe₈₉Zr₇B₃Cu₁

LOW TEMPERATURE PHASES OF MICROCRYSTALLINE FeCl₃

Synthesis of Ferrite Nanocrystals Stabilized by Ionic‐Liquid Molecules through a Thermal Decomposition Route

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A Simple Model for Amorphous and Liquid Ferromagnets

Cited by 301 publications

References 2 publications

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe89Zr7B3Cu1

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe89Zr7B3Cu1

LOW TEMPERATURE PHASES OF MICROCRYSTALLINE FeCl3

Synthesis of Ferrite Nanocrystals Stabilized by Ionic‐Liquid Molecules through a Thermal Decomposition Route

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A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe₈₉Zr₇B₃Cu₁

A Small Angle Polarized Neutron Scattering Investigation of Magnetic Correlations in Nanocrystalline Fe₈₉Zr₇B₃Cu₁

LOW TEMPERATURE PHASES OF MICROCRYSTALLINE FeCl₃