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Magnetic properties of Fe - Fe oxide particle systems.

Racka K., Gich M., Roig A., Krzyżewski A., Ślawska-Waniewska A.

Archives of Materials Science

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2004

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Vol. 25, nr 4

469-475

EN

Aerosol Fe nanoparticles in the as prepared state and embedded in a pours matrix of silica aerogel have been studied. The particles form agglomerates in which the magnetic coupling is maintained by the long-range dipolar interactions. The role of the silica medium consists in a reduction of the aggregate sizes down to pore sizes (20-100 nm) thus reducing the coercivity and remanence and enhancing the thermal fluctuation effects.

2

Ultrasound Velocities in Fe64Ni10Nb3Cu1Si13B9 Alloy

Kaczkowski Z., Barandiaran J., Gutierrez J., Vlasak G., Svec P., Duhaj P., Milewska E., Krzyżewski A., Danis E.

Molecular and Quantum Acoustics

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2002

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Vol. 23

201-212

EN

The ultrasound velocities at constant magnetic filed (cH) and at constant induction (cB), in the 50 mm long strips cut from the Fe64Ni10Nb3Cu1Si13B9 alloy ribbon were measured is as-quenched state and after annealing hot 1h in vacuu, from 100??? C to 550??? C. These velocities were changing from 3200 to 5320 m/s depending on the heat-treatment and magnetic bias field.

3

Ultrasound velocities in Fe44Ni30Nb3Cu1Si13 B9 alloy strips

Kaczkowski Z., Vlasak G., Svec P., Duhaj P., Milewska E., Krzyżewski A., Danis E.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

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2001

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Vol. 83, nr 27

407-412

EN

Strips cut out from the Fe44Ni30Nb3Cu1 Si13B9 metallic glass alloy ribbons were measured in as-quenched state and after annealing, for 1 h in vacuum in the temperature range from 350 to 500°C. The strips were 50 mm long, 4.5-5.0 mm wide and about 20 žm thick. The resonat-antiresonat method was used. The ultrasound velocities in the strips depending on the heat-treatment and magnetic bias field were changing from about 3500 to 5000 m/s. The maximum values of the magnetomechanical coupling coefficient (km = 0.58) were obtained after annealing at 450°C. After annealing at 470°C the magnetomechanical coupling coefficient dropped to 0.49 because the noncrystalline structure had began to form.

4

Magnetomechanical coupling in Fe73.5Cu1Nb1Ta2Si13.5B9 alloy strips after annealing up to 700°C and its dependence on magnetic field

Kaczkowski Z., Vlasak G., Śvec P., Duhaj P., Milewska E., Krzyżewski A., Danis E.

Hydroacoustics

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2001

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Vol. 4

105--108

EN

A magnetomechanical coupling in the Fe73.5Cu1Nb1Ta2Si13.5B9 metallic glass strips in as-quenched state and after annealing in vacuum at the temperature range from 100 to 700oC was investigated. The maximum values of the magnetomechanical coupling coefficient (k) were obtained after annealing at 450oC (km = 0.38). Decrease of the magnetomechanical coupling (to 0.2 after annealing at 470oC, to 0.15 after annealing at 500oC, and to zero after annealing at 700oC) and a drop of the saturation magnetostriction (αs) of this alby from (23-25) x 10-6 for as-quenched state and after annealing at 450oC to 10 x 10-6 after annealing at 500oC, and to about 2 x 10-6 after annealing at 550oC is connected with the forming of the nanocrystalline phase. The ultrasound velocities in the strips depending on the heat treatment and magnetic bias field were changing from 3600 to 5300 m/s.

5

Ultrasound Velocities In Fe 73.5 Cu1 Nb1, Ta2 Si13.5 B9 Alloy Strips After Annealing in Vacuum Above Curie Temperature and Their Dependence on Magnetic Field

Kaczkowski Z., Vlasak G., Śvec P., Buhaj P., Milewska E., Krzyżewski A., Danis E.

Molecular and Quantum Acoustics

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2000

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Vol. 21

101-108