Soft-Magnetic Materials

Buschow, K.H.J.; Boer, F.R. de

doi:10.1007/0-306-48408-0_14

Cited by 79 publications

(82 citation statements)

References 6 publications

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“…The thin film peak of MgFe 2 O 4 (400) is located around 43.18°, consistent with the wellestablished values, indicating an epitaxial growth mode for the films [25]. However the substrate-film peak separation decreases with a decrease in growth rate indicating substantial changes in either thin film composition or strain.…”

Section: Crystallographic Propertiessupporting

confidence: 86%

Growth and characterization of epitaxial magnesium ferrite thin films

et al. 2016

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Epitaxial magnesium ferrite thin films have been grown by molecular beam epitaxy (MBE) on MgO(100). Growth conditions such as substrate temperature and growth rates were optimized. By using different characterization techniques, structural, electrical and optical properties of the films were studied as a function of Mg content. In particular, we highlight the importance of the growth rate on the actual Mg/Fe ratio in the film.

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Section: Crystallographic Propertiessupporting

confidence: 86%

Growth and characterization of epitaxial magnesium ferrite thin films

et al. 2016

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“…This leads together with the interaction of the local crystal field with the 4f Tb orbital, which has a disk-like ellipsoidal shape (magnetic moment pointing out perpendicular to the plane of the ellipsoid), via spin-orbit coupling to an outof-plane oriented sample magnetization (single ion anisotropy) (Prados et al, 1997;Skomski and Sellmyer, 2009). Hence, the magnetic order in Tb-Fe arises from the competition between the local magnetic anisotropies due to the local structural order and exchange interactions (Campbell, 1972;Rebouillat et al, 1977;Coey, 1978;Handrich and Kobe, 1980;Buschow, 1991;Duc, 1993;du Trémolet de Lacheisserie et al, 2005). This competition leads to a local distribution of the Tb and the Fe magnetic moments in the Tb and Fe sublattices (Coey, 1978), known as sperimagnetism (see Figure 1).…”

Section: Hebler Et Al Ferrimagnetic Tb-fe Alloy Thin Filmsmentioning

confidence: 99%

Ferrimagnetic Tb–Fe Alloy Thin Films: Composition and Thickness Dependence of Magnetic Properties and All-Optical Switching

et al. 2016

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Ferrimagnetic rare earth -transition metal Tb-Fe alloy thin films exhibit a variety of different magnetic properties, which depend strongly on composition and temperature. In this study, first the influence of the film thickness (5-85 nm) on the sample magnetic properties was investigated in a wide composition range between 15 and 38 at.% of Tb. From our results, we find that the compensation point, remanent magnetization, and magnetic anisotropy of the Tb-Fe films depend not only on the composition but also on the thickness of the magnetic film up to a critical thickness of about 20-30 nm. Beyond this critical thickness, only slight changes in magnetic properties are observed. This behavior can be attributed to a growth-induced modification of the microstructure of the amorphous films, which affects the short range order. As a result, a more collinear alignment of the distributed magnetic moments of Tb along the out-of-plane direction with film thickness is obtained. This increasing contribution of the Tb sublattice magnetization to the total sample magnetization is equivalent to a sample becoming richer in Tb and can be referred to as an "effective" composition. Furthermore, the possibility of all-optical switching, where the magnetization orientation of Tb-Fe can be reversed solely by circularly polarized laser pulses, was analyzed for a broad range of compositions and film thicknesses and correlated to the underlying magnetic properties.

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“…These values were comparable to the K values of CoFe 2 O 4 bulk materials ((1.8-3.0) × 10 6 ergs/cm 3 ). 11 Using the methods of Zhang et al, 7 we were able to obtain the distribution function of the magnetic anisotropy energy The calculated anisotropy energy distributions of the 6 and 9 nm cobalt ferrite nanocrystals are shown in Figure 4 and were fitted using Gaussian functions with center and width values of 145.8 and 63.1 and 182.0 and 62.6 K, respectively. In general, the anisotropy energy distribution depends on the volume and shape distributions of the nanocrystals.…”

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confidence: 99%

Synthesis of Highly Crystalline and Monodisperse Cobalt Ferrite Nanocrystals

et al. 2002

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Highly crystalline and monodisperse cobalt ferrite nanocrystals were fabricated by the high-temperature aging of a metal-surfactant complex followed by mild oxidation. Particle sizes were varied from 4 to 9 nm by changing the experimental conditions. Transmission electron microscopic (TEM) images of the particles showed two-and three-dimensional assembly of the particles, demonstrating the uniformity of the nanocrystals. Electron diffraction, X-ray diffraction, and high-resolution transmission electron microscopic images of the nanocrystals confirmed the highly crystalline nature of the cobalt ferrite structure. The elemental analysis confirmed the stoichiometry of cobalt ferrite, despite some variations in the relative atomic composition of nanocrystals. The nanocrystals were found to have typical behaviors of magnetic nanocrystals and the narrow energy barrier distributions of magnetic anisotropy, implying that the nanocrystals obtained are very uniform.The development of uniform magnetic nanocrystals has been intensively pursued because of their applications in magnetic data storage, ferrofluids, medical imaging, drug targeting, and catalysis. 1,2 Recently, several metallic magnetic nanocrystals of uniform particle size have been fabricated. 3 Magnetic oxide nanocrystals having uniform particle size have been synthesized. 4,5 However, a very difficult size-selection process was required to obtain magnetic nanocrystals having uniform particle size distribution. Recently, we developed a new procedure for producing highly crystalline and monodisperse γ-Fe 2 O 3 nanocrystals without a size-selection process. 6 These iron oxide nanocrystals were synthesized from the controlled oxidation of uniform iron nanoparticles generated from the thermal decomposition of an iron-surfactant complex. We have extended the synthetic method to fabricate bimetallic oxide nanocrystals and report upon the synthesis of monodisperse and highly crystalline cobalt ferrite nanocrystals.In the synthetic procedure, uniform iron-cobalt alloy nanoparticles were first generated from the thermal decomposition of a metal-oleate complex and further oxidized to yield cobalt ferrite nanocrystals. The precursor, (η 5 -C 5 H 5 )CoFe 2 (CO) 9 , was prepared using the previously reported synthetic procedure. 7 A typical synthesis of cobalt ferrite nanocrystals with a particle diameter of 6 nm is as follows. A total of 0.2 g of (η 5 -C 5 H 5 )-CoFe 2 (CO) 9 (1.23 mmol; total metal atoms) was added to a mixture containing 5 mL of dioctyl ether and 1.04 g of oleic acid (3.69 mmol) at room temperature under an argon atmosphere. The mixture was heated to reflux (∼300°C) and kept at that temperature for 1 h. The color of the reaction mixture changed to clear blue at 230°C and to black at the reflux temperature. The blue color formed at 230°C seemed to be due to a metal oleate complex. The resulting black solution was cooled to room temperature, and 0.28 g of dehydrated (CH 3 ) 3 -NO (3.69 mmol) was added. The mixture was then heated to 130°C under an argon...

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Soft-Magnetic Materials

Cited by 79 publications

References 6 publications

Growth and characterization of epitaxial magnesium ferrite thin films

Growth and characterization of epitaxial magnesium ferrite thin films

Ferrimagnetic Tb–Fe Alloy Thin Films: Composition and Thickness Dependence of Magnetic Properties and All-Optical Switching

Synthesis of Highly Crystalline and Monodisperse Cobalt Ferrite Nanocrystals

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