Structural and magnetic properties of mechanically alloyed FeCo powders

Zeleňáková, A.; Olekšáková, D.; Degmová, Jarmila; Kováč, J.; Kollář, P.; Kusý, Martin; Sovák, P.

doi:10.1016/j.jmmm.2007.03.005

Cited by 47 publications

(32 citation statements)

References 5 publications

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“…Unusual high value of coercivity H C ≈ 2850 Oe measured at 2 K, and the shape of hysteresis loop can be caused by additional antiferromagnetic interaction probably due to a dipolar interaction among particles or due to interaction of particles in core/shell structure [5]. DC magnetic data were fitted by both Langevin function for non-interacting particles and modified Langevin function for interacting nanoparticles [2][3][4][5][6]. The analyses of fitted procedure confirm the superparamagnetic behaviour of interacting particles in our system.…”

Section: Resultssupporting

confidence: 68%

“…This is qualitative confirmation of blocking/freezing process in Fe/Au nanoparticles system. The AC susceptibility data were fitted by both Arrhenius law valid for a system of non-interacting particles and by Vogel-Fulcher law describing system of interacting particles [2][3][4]6]. The quantitative analysis of χ due to the value of parameter C 1 = ∆T B /(T B ∆ log f ) = 0.00242 confirms the existence of inter-particle interaction in our system.…”

Section: Resultsmentioning

confidence: 54%

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Magnetic Study of the Fe Coated by Au Nanoparticles

Zeleňáková

Kováč²,

Kavečanský³

et al. 2008

Acta Phys. Pol. A

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Nanosized iron-gold magnetic nanoparticles with an average particle size 10 nm were prepared by a reverse micelle method. The magnetic properties measurements of DC and AC magnetization confirm behaviour typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, the frequency dependence of a blocking temperature T B , and revealing of coercivity H C below blocking temperature. The quantitative analysis of AC susceptibility due to value of parameter C 1 = ∆T B /(T B ∆ log f ) = 0.0242 confirming the existence of inter-particle interaction in our system.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 54%

Magnetic Study of the Fe Coated by Au Nanoparticles

Zeleňáková

Kováč²,

Kavečanský³

et al. 2008

Acta Phys. Pol. A

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“…After alloying the diffraction peaks of pure elements hcp Co and fcc Co phases completely disappear due to diffusion of Co into bcc Fe structure forming the Fe-Co solid solution [6].…”

Section: Methodsmentioning

confidence: 99%

“…The advantage of this process technology is that the powder can be produced in large quantities and the processing parameters can be easily controlled [4]. Some researches concerning Fe-Co powders system produced by mechanical milling were reported in [3,[5][6][7]. * corresponding author; e-mail: denisa.oleksakova@tuke.sk…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Sintered Fe_{50}Co_{50} Powder Cores

et al. 2017

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We investigated coercivity, total losses and complex permeability of sintered Fe-Co powder cores to detect magnetization processes performing in ac magnetic field. The Fe-Co solid solution alloy powders with 50:50 wt% ratio were prepared by 1, 15, and 20 h alloyed mixture of pure chemical elements in planetary ball mill. The resulting powder was subsequently sintered into a disk form. The compaction was performed at a pressure of 800 MPa for 5 min at temperatures of 400•

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“…They are typical of disordered Fe 50 Co 50 conventional alloy [8][9][10]. Mean hyperfine field value is lower than those reported for mechanically alloyed Fe 50 Co 50 system [11,12,2,13,14]. Dispersion of HFD is about 3 times larger than in the case of the ordered Fe 50 Co 50 alloy ( [8] -59 Co spin-echo NMR data, 30 days annealed samples).…”

Section: Resultsmentioning

confidence: 91%

Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder

et al. 2009

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Magnetic and structural studies were performed on Fe 50 Co 50 material. The samples (disk-shaped, diameter: 10 mm, thickness: 2.5 mm) were fabricated by compaction of powder under pressure of 800 MPa for 5 min at temperatures 300-600• C. The powder was obtained by milling of Fe 50 Co 50 alloy swarfs in high-energy planetary mill. The milling time varied from 1 h to 40 h. In the course of milling process the mean size of alloy pieces was decreasing from about 0.5 mm to 0.05 mm (scanning electron microscopy), which provided more compact structure after compression. The annealing process during compaction strongly reduces a coercive field of the samples. Parameters of conversion electron Mössbauer spectra are almost the same for all samples, which points to not significant changes of atomic and magnetic order after milling and compacting.

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Structural and magnetic properties of mechanically alloyed FeCo powders

Cited by 47 publications

References 5 publications

Magnetic Study of the Fe Coated by Au Nanoparticles

Magnetic Study of the Fe Coated by Au Nanoparticles

Magnetic Properties of Sintered Fe_{50}Co_{50} Powder Cores

Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder

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