New bulk amorphous Fe–(Co,Ni)–M–B (M=Zr,Hf,Nb,Ta,Mo,W) alloys with good soft magnetic properties

Inoue, Akihisa; Zhang, Tao; Koshiba, Hisato; Makino, Akihiro

doi:10.1063/1.367811

Cited by 145 publications

(61 citation statements)

References 16 publications

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“…For our investigations, we have chosen amorphous Co 56-Fe 16 Zr 8 B 20 alloy which is known to exhibit large super-cooled liquid region and excellent soft magnetic properties, e.g. high permeability in the frequency range up to 1 MHz [3]. In a previous work [4] we have shown that short-time BM of this alloy results in mechanically-induced crystallization.…”

Section: Introductionmentioning

confidence: 99%

Influence of cryomilling on structure of CoFeZrB alloy

Bednarčı́k

Saksl

Nicula

et al. 2008

Journal of Non-Crystalline Solids

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a b s t r a c t X-ray diffraction experiments indicate that cryomilling of an amorphous CoFeZrB alloy significantly retards mechanically-induced crystallization. After 12 h of milling, the samples consist mostly of an amorphous component and tiny fraction of bcc-Fe. Significant changes are observed on the radial distribution function, suggesting the reordering of atoms within the amorphous phase. Investigation of thermal stability and magnetic properties also indicate that the observed changes upon cryomilling are related to changes in the amorphous phase.

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Section: Introductionmentioning

confidence: 99%

Influence of cryomilling on structure of CoFeZrB alloy

Bednarčı́k

Saksl

Nicula

et al. 2008

Journal of Non-Crystalline Solids

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“…The recent research on soft-magnetic nanocomposites was reviewed by several authors [4][5][6][7][8]. The search for bulk amorphous metallic glasses with good soft magnetic properties [8], further led to the discovery of Co-rich bulk amorphous alloys in the Co-Fe-M-B alloy system (M: Zr, Nb) [9]. The new Co-based amorphous alloys exhibit low coercivity and stable high permeability in the frequency range up to 1 MHz.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution during Thermal Processing : Insight from In-Situ Time-Resolved Synchrotron Radiation Experiments

Bednarčı́k

Nicula

Saksl

et al. 2007

MSF

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Abstract. The magnetic, mechanical or chemical properties of nanocrystalline materials strongly differ from the ones of their coarse-grained counterparts. Moreover, significant changes of the phase diagrams were already evidenced for nanostructured alloys. Thermal processing with or without applied pressure controls the microstructure development at the nanometer scale and thus essentially decides upon the final nanomaterial behaviour and properties. A common route for the synthesis of metallic nanomaterials is the devitrification of amorphous precursors obtained via non-equilibrium processing, e.g. by rapid solidification or high-energy ball-milling. Time-resolved in-situ X-ray diffraction experiments may nowadays be performed at high-brilliance synchrotron radiation sources for a variety of temperature-pressure conditions. The temperature-time evolution of the grain-size distribution and microstrain can be monitored in detail at specimen-relevant scales. Together with local information from electron microscopy and chemical analysis, in-situ X-ray experiments offer a complete set of tools for engineering of the microstructure in nanomaterials. The effect of individual processing steps can be distinguished clearly and further tuned. An example is provided, concerning the high-temperature microstructure development in Co-rich soft magnetic nanostructured alloys. IntroductionModern nanostructured soft-magnetic alloys typically consist of nanocrystalline ferromagnetic grains embedded in an amorphous phase. This type of nanocomposite microstructure provides an efficient averaging of the magneto-crystalline anisotropy and magnetostrictive coefficients of the nanophase over a large number of grains within the nanomaterial.During the past years, several Fe-based soft-magnetic nanostructured alloys were developed, e.g. Fe 73.5 Si 13.5 B 9 Nb 3 Cu 1 (FINEMET, [1] (HITPERM, [3]). The recent research on soft-magnetic nanocomposites was reviewed by several authors [4][5][6][7][8]. The search for bulk amorphous metallic glasses with good soft magnetic properties [8], further led to the discovery of Co-rich bulk amorphous alloys in the Co-Fe-M-B alloy system (M: Zr, Nb) [9]. The new Co-based amorphous alloys exhibit low coercivity and stable high permeability in the frequency range up to 1 MHz. Wide supercooled liquid regions of up to 80 K were evidenced for Co-Fe-Zr-B alloys with Fe content in excess of 14 at.%. Cobalt-rich alloys with nearly zero magnetostriction were as well obtained at lower Fe concentrations, near to 2 at.% [10]. There is an increasing interest in the further development of these alloys, in view of their unique combination of soft-magnetic and mechanical properties. In-situ high-temperature X-ray diffraction using synchrotron radiation and thermal analysis were used to investigate the nano-

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“…1,2 The materials are usually fabricated either by rapid quenching from the molten state or in thin film form by sputtering. They can exhibit unique mechanical properties, 3 improved corrosion resistance, 4,5 very soft magnetic response, 6 and high magnetic moment and Curie temperatures. From a technological point of view, they are the best-known materials for stress sensing, having magnetomechanical coupling factors k 2 ͑ratio of energy transfer between the mechanical and magnetic subsystems͒ approaching unity.…”

Section: Introductionmentioning

confidence: 99%

Stress and magnetoelastic properties control of amorphous Fe80B20 thin films during sputtering deposition

Fernández-Martínez

Costa‐Krämer

Briones

2008

Journal of Applied Physics

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In situ stress measurements during sputtering deposition of amorphous Fe 80 B 20 films are used to control their stress and magnetoelastic properties. The substrate curvature induced by the deposited film is measured optically during growth and quantitatively related to the deposition induced accumulated stress. The resulting magnetic properties are later correlated with the measured stress for a wide range of sputtering pressures ͓͑2−25͒ ϫ 10 −3 mbar͔. A significant tensile stress develops at the film-substrate interface during the early growth stages ͑initial 2-3 nm͒. At a critical thickness, a transition is observed from tensile to compressive stress, which is associated with amorphous island coalescence. By further increasing the thickness, a compressive stress follows, which is related to the local distortion induced by the ion peening effect. The Monte Carlo simulations of the sputtering process describe quantitatively the experimental results as a function of the Ar pressure and target bias voltage.

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New bulk amorphous Fe–(Co,Ni)–M–B (M=Zr,Hf,Nb,Ta,Mo,W) alloys with good soft magnetic properties

Cited by 145 publications

References 16 publications

Influence of cryomilling on structure of CoFeZrB alloy

Influence of cryomilling on structure of CoFeZrB alloy

Microstructure Evolution during Thermal Processing : Insight from In-Situ Time-Resolved Synchrotron Radiation Experiments

Stress and magnetoelastic properties control of amorphous Fe80B20 thin films during sputtering deposition

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