Magnetic interactions in Fe-Zr-B-Cu nanocrystalline materials at elevated temperatures

Ślawska‐Waniewska, A.; Nowicki, P.; Lachowicz, H.K.; Gorría, P.; Barandiarán, J.M.; Hernando, A.

doi:10.1103/physrevb.50.6465

Cited by 67 publications

(32 citation statements)

References 10 publications

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“…Since the discovery of FeZrB nanocrystalline alloy, it has attracted a lot of attention owing to its soft magnetic character [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. It is well known that magnetic properties of ferromagnetic materials can be improved by modifying their microstructure.…”

Section: Introductionmentioning

confidence: 99%

“…Low coercivity (H c ) is one of the most important parameters of the excellent soft magnetic properties. Coercivity of FeZrB(Cu) alloy as a function of annealing temperature was investigated over the past several decades [11][12][13][14]. However, it is remarkable to note that little attention has been paid for the H c of FeZrB(Cu) alloy prepared by mechanical alloying (MA).…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe₆₈Zr₂₀B₁₂Alloy Prepared by Mechanical Alloying

Sun

Zhong

2011

Acta Phys. Pol. A

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Fe 68 Zr 20 B 12 amorphous alloy prepared by mechanical alloying technique of 60 h of duration was annealed at different temperatures (420-720• C) during 1 h. Microstructure and magnetic property of as-milled and annealed alloy were investigated by X-ray diffraction, transmission electron microscopy, the Mössbauer spectroscopy and vibrating sample magnetometer techniques. Fe 68 Zr 20 B 12 powders milled during 60 h exhibit amorphous character. After annealing at 420• C, α-Fe phase precipitates from amorphous matrix. Transmission electron microscopy analysis shows the nucleation and growth of α-Fe grains. The Mössbauer results of the annealed alloy at 670• C show that the Fe 3 B phase precipitates already and there is still remaining amorphous phase. Coercivity increases with increasing annealing temperature, which is closely related to the microstructures after annealing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe₆₈Zr₂₀B₁₂Alloy Prepared by Mechanical Alloying

Sun

Zhong

2011

Acta Phys. Pol. A

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“…The displacement of the magnetic transition (decoupling of the ferromagnetic crystallites) above T C2 in nanocrystalline soft magnetic samples has been previously reported, 7,8 mainly through the analysis of the temperature dependence of the coercivity, H c . In those reports, the shift is mainly observed in samples with high crystalline fractions ͑ c Ϸ 1͒ where the mean distance between the ferromagnetic grains (width of the paramagnetic amorphous phase) is within the nanometer range ͑Ϸ1 nm͒.…”

Section: A Enhancement Of the Exchange Coupling With The Applied Magmentioning

confidence: 99%

“…As an example, the shift of the magnetic transition (magnetic decoupling between ferromagnetic crystallites) above T C2 has been extensively reported and correlated to the occurrence of exchange coupling between the ferromagnetic grains through the paramagnetic amorphous matrix. 7,8 However, there are some experimental facts related with the analysis of the magnetic transition and the magnetic decoupling of ferromagnetic crystallites that needs to be analyzed in further detail. In particular, when this magnetic transition is analyzed through the temperature dependence of the ac magnetic permeability, a maximum in the irreversible contribution is detected at measuring temperature, T P , around T C2 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic transition in nanocrystalline soft magnetic alloys analyzed via ac inductive techniques

et al. 2004

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The magnetic transition in a FeSiBCuNb nanocrystalline alloy, associated with the decoupling of ferromagnetic crystallites around the Curie point of the residual amorphous matrix, is analyzed in this work through the temperature dependence of the ac axial magnetic permeability and impedance of the samples. The temperature dependence of both complex magnitudes presents a maximum in the irreversible contribution at a certain transition temperature. While for low values of the exciting ac magnetic field the transition temperature lies below the Curie temperature of the amorphous phase, a shift above this Curie point is observed increasing the amplitude of the applied ac magnetic field. The detected field dependence is interpreted taking into account the ac nature of the inductive characterization techniques and the actual temperature dependence of the coercivity of the samples.

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“…It is likely that these reported values also might correspond to compensation temperatures. 19 In order to inquire into the nature of the magnetic phase transition observed for temperatures above 235 K, we have measured the temperature dependence of thermoremanence ͑TRM͒ for a temperature range between 5 K and 800 K ͑see Fig. 4͒.…”

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Field and temperature dependence of magnetization in FeCu-based amorphous alloys

et al. 2000

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In this paper, the production of FeCu-based FeCuZr amorphous alloys by ball milling is reported. The thermal dependence of magnetization for the ͑Fe 0.5 Cu 0.5 ͒ 85 Zr 15 (at. %) amorphous alloy has been found to show a dramatic field dependence of the kink point of the magnetization. This kink corresponds to a temperature different from the Curie temperature, above 400 K, of the ferromagnetic phase, which, according to spin waves fitting, can be induced by applying external fields. Just above 235 K, the thermoremanence increases sharply, and this feature strongly suggests an increase of the ferromagnetic ordering under zero field heating. Neutron diffraction experiments seem to confirm the enhancement of spin alignment. The thermal expansion above the compensation temperature is proposed to be the origin of the thermoremanence enhancement through the anti-Invar effect as might be explained within the framework of recent ab initio calculations ͓M. van Schilfgaarde et al., Nature ͑London͒ 400, 46 ͑1999͔͒.The FeCu system is a typical one with a high and positive enthalpy of mixing. 1 However, extended regions of metastable solubility can be obtained via several nonequilibrium processing techniques, such as vapor-quenching, 2 sputtering, 3 and mechanical alloying. 4,5 The crystalline structure of the Fe x Cu 1Ϫx solid solutions depends on the Fe content, being fcc for xϽ60 at. %, bcc for xϾ70 at. %, whereas a mixture of fcc and bcc phases is observed for the intermediate composition range. The fcc alloys have attracted a special interest because they exhibit ferromagnetic behavior for a wide range of compositions ͑above 20 at. % in Fe͒, although fcc-Cu or fcc-Fe at their ground state, are not ferromagnetic. 3,[6][7][8] In particular, EXAFS experiments carried out in fcc-Fe 0.5 Cu 0.5 ͑Ref. 9͒ have shown that the lattice is expanded with respect to the fcc Cu lattice, therefore is likely that Invar effects 10 are related to the ferromagnetic behavior of fcc-FeCu alloys.To induce amorphicity in the FeCu system we have added 15 at. % of Zr. Notice that FeZr amorphous alloy exhibit typical Invar properties as high volume magnetostriction 11 and a remarkable Curie temperature dependence on the hydrostatic pressure. 12 Amorphous powders of nominal composition ͑Fe 0.5 Cu 0.5 ͒ 85 Zr 15 (at. %) were obtained by high energy ball milling in a planetary mill with hardened stainless-steel vials and 10 mm diameter stainless-steel balls in a ball-to-powder weight ratio of 15:1. In order to avoid the oxidation of the powder during the milling, the vials were sealed under argon atmosphere prior to the milling. The composition of the final powder was checked by energy dispersive x-ray analysis ͑EDX͒. No traces of others elements, such as Cr or Ni, coming from the milling vial or balls were detected in the analysis of the EDX results. X-ray-diffraction pattern shows the typical broad halo characteristic of amorphous systems; see Fig. 1͑a͒. The XRD pattern of a nanocrystalline of a fcc-͑Fe 0.5 Cu 0.5 ͒ 93 Zr 7 (at. %) solid solution,...

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Magnetic interactions in Fe-Zr-B-Cu nanocrystalline materials at elevated temperatures

Cited by 67 publications

References 10 publications

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe₆₈Zr₂₀B₁₂Alloy Prepared by Mechanical Alloying

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe₆₈Zr₂₀B₁₂Alloy Prepared by Mechanical Alloying

Magnetic transition in nanocrystalline soft magnetic alloys analyzed via ac inductive techniques

Field and temperature dependence of magnetization in FeCu-based amorphous alloys

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Magnetic interactions in Fe-Zr-B-Cu nanocrystalline materials at elevated temperatures

Cited by 67 publications

References 10 publications

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe68Zr20B12Alloy Prepared by Mechanical Alloying

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe68Zr20B12Alloy Prepared by Mechanical Alloying

Magnetic transition in nanocrystalline soft magnetic alloys analyzed via ac inductive techniques

Field and temperature dependence of magnetization in FeCu-based amorphous alloys

Contact Info

Product

Resources

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Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe₆₈Zr₂₀B₁₂Alloy Prepared by Mechanical Alloying

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of Fe₆₈Zr₂₀B₁₂Alloy Prepared by Mechanical Alloying