Magnetic and Mössbauer Studies of Fe76Mo8Cu1B15 Nanocrystalline Alloy

Miglierini, Marcel; Kaňuch, T.; Krenický, Tibor; Škorvánek, I.

doi:10.1007/s10582-004-0033-3

Cited by 14 publications

(15 citation statements)

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“…The ribbons were fixed with an adhesive tape on a substrate only at the ends to avoid mechanical stresses, especially tensile stresses at low temperature experiments. Hyperfine parameters of the spectra were refined using the NORMOS fitting software according to the model described elsewhere [4]. Magneto-optical Kerr effect (MOKE) was observed at room temperature using a He-Ne laser (λ = 632.8 nm) with the phase angle, ϕ 0 , of incident laser light of about 50 • and a frequency of 50 kHz.…”

Section: Methodsmentioning

confidence: 99%

“…A 23 values can vary between 0 and 4 (spins perpendicular to and parallel with the ribbon plane, respectively). The spectra were described using three components [4] and the A 23 parameter was fitted assuming equal values for all of them. Deviations in relative line intensities, particularly those of the crystalline component (the 2 nd and 5 th lines), are clearly seen in Fig.…”

Section: Mössbauer Spectrometrymentioning

confidence: 99%

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Effect of annealing in an external magnetic field on the magnetic texture of Mo-containing nanocrystalline alloys

et al. 2006

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The magnetic texture of (Fe1−xCox)76Mo8Cu1B15 (x = 0, 0.5) nanocrystalline alloys is studied for different amounts of nanocrystalline grains. The originally amorphous alloys were annealed in external longitudinal and transverse magnetic fields of 0.025 T and 0.8 T, respectively. Mössbauer measurements were carried out at room and liquid nitrogen temperatures in order to gain information on the hyperfine interactions and the orientation of the magnetization. The obtained results are compared with those received from zero-field annealed samples. Magneto-optical Kerr effect (MOKE) was applied for the investigation of possible changes at the surface of the x = 0 ribbon as a function of annealing temperature and applied magnetic field. A combination of uniaxial anisotropy, which originates from the shape anisotropy, and four-fold anisotropy, which is a contribution from crystallites of nanometre size embedded in the residual amorphous matrix, is unveiled.

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Section: Methodsmentioning

confidence: 99%

Section: Mössbauer Spectrometrymentioning

confidence: 99%

Effect of annealing in an external magnetic field on the magnetic texture of Mo-containing nanocrystalline alloys

et al. 2006

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“…Consequently, the trapping centres for positrons can be related with the onset of secondary crystallization, growth of grains, and their clustering, structural change from bcc to fcc arrangement, possible distortions at interface of the grains, as well as formation of iron boride crystallites. Magnetic measurements performed upon the same NANOPERM-type system [3] pointed out an optimal value of coercive force after annealing at T a = 550 °C. Figure 3 shows the overall temperature dependence of coercive force H c against T a .…”

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confidence: 87%

“…In order to benefit from the advantageous and unique properties of nanocrystalline materials, their structure as well as magnetic arrangement should be know. For this purpose, investigations with a variety of microscopic and/or nuclear-based techniques are performed [2] in addition to conventional magnetic measurements [3]. In this paper we employ positron annihilation lifetime spectroscopy (PALS) to study the evolution of the interface structure of NANOPERM-type metallic alloy.…”

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Nanocrystalline alloys studied by positron annihilation lifetime spectroscopy

Petriska

Pavúk

Slugeň

et al. 2007

Phys. Status Solidi (c)

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Nanocrystalline alloys present a new class of materials that exhibit interesting magnetic properties. These stem primarily from the presence of crystalline grains with the size of several tens of nanometers embedded in a residual amorphous matrix. In this paper, we employ positron annihilation spectrometry to investigate the relation between positron lifetime and microstructure of the NANOPERM-type metallic Fe 76 Mo 8 Cu 1 B 15 alloy. The behaviour of positron lifetime with respect to the annealing temperature is discussed for samples, which were prepared by one hour thermal treatment in a vacuum at temperatures ranging from 330 up to 700 °C. Samples in amorphous (as-quenched) state were analysed, too. The results of this work confirm that the optimum annealing temperature of 550 °C correlates with the minimum of free volume and coincide with the temperature at which superior magnetic properties are observed. 1 Introduction Nanocrystalline materials obtained by annealing of amorphous precursors exhibit unusual two-phase structure (viz. crystalline and amorphous residual phase). These new materials are very attractive due to their soft magnetic properties combining high saturation magnetic flux density with high permeability. Amorphous and nanocrystalline metals have found their application primarily in the production of electrical power distribution transformers and high frequency switching power supplies [1]. In order to benefit from the advantageous and unique properties of nanocrystalline materials, their structure as well as magnetic arrangement should be know. For this purpose, investigations with a variety of microscopic and/or nuclear-based techniques are performed [2] in addition to conventional magnetic measurements [3]. In this paper we employ positron annihilation lifetime spectroscopy (PALS) to study the evolution of the interface structure of NANOPERM-type metallic alloy. For that purpose we have used Fe 76 Mo 8 Cu 1 B 15 model composition. Measurements were performed at the Department of Nuclear Physics and Technology, SUT in Bratislava.

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