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Influence of Ball Milling on the Local Atomic Structure of an Amorphous CoFeSiB Alloy

100%
Bednarcik J., Michalik S., Kollar P., Roth S.
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issue 5
825-826
EN
It follows from experimental observations that ball milling induces substantial changes in an amorphous Co_{70.3}Fe_{4.7}Si_{10}B_{15} (at.%) alloy. X-ray diffraction indicates formation of nanocrystalline bcc-(Co,Fe) phase during ball milling. As a consequence crystallization sequence is altered and the total enthalpy of crystallization reduces with the milling time. Furthermore thermomagnetic measurements reveal that specific magnetization and Curie temperature of amorphous phase are influenced by ball milling.
2
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Survey of Industrial Applications of Conducting Polymers

100%
Roth S., Graupner W., Mcneillis P.
Acta Physica Polonica A
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1995
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vol. 87
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issue 4-5
699-711
EN
Seventeen years after the first publication of doped polyacetylene we have already seen the appearance and disappearance of commercial products based on conducting polymers. In the present report we want to summarize the status quo in this field paying attention to existing products, laboratory demonstration set-ups and promising concepts.
3
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Soft Magnetic Properties in Bulk Permalloy Alloys Fabricated by a Warm Consolidation

100%
FŰzer J., Kollár P., Olekšáková D., Roth S.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
59-62
EN
Soft magnetic properties of bulk NiFe and NiFeMo alloys consolidated by hot compaction were studied. During annealing the compacts residual stresses diminish by relaxation and soft magnetic properties improve. The lowest coercivity of bulk NiFe and NiFeMo alloys are 11. 0 and 11. 2 A/m, respectively, while the total losses are 1. 81 and 1. 42 W/g at f=10 kHz and B_{max} =0. 2 T.
4
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Influence of Oxygen Impurities on Electrical Properties of Fullerene C_{60}

100%
Rabenau T., Roth S., Kremer R. K.
Acta Physica Polonica A
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1995
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vol. 87
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issue 4-5
881-884
EN
We present high temperature dc, ac and contactless microwave conduc­tivity results on solid-state C_{60} (films and crystals) from room temperature up to 850 K. Heating pristine samples, which were exposed to the ambi­ent atmosphere, under dynamic vacuum at first leads to a reduction of the electrical resistance and finally, above ≈700 K, to an increase in the re­sistance. The decrease is ascribed to oxygen desorption and the increase to the chemical reactivity of residual chemisorbed oxygen with the C_{60} host molecules, respectively. Samples, annealed above 800 K, display a reversible temperature dependence of the resistance. The high temperature regime of their resistance exhibits an activated behaviour with an universal activation energy of 2E_{a} = 1.85 ± 0.04 eV for crystals and films, which is identical to the HOMO-LUMO splitting of the C_{60}-molecules.
5
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Rectification in Fullerene (C_{60})-Phthalocyanine Thin Film Sandwich Structures

100%
Anderson T., Akselrod L., Fischer C. M., Roth S.
Acta Physica Polonica A
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1995
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vol. 87
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issue 4-5
877-880
EN
Bilayer sandwich structures were fabricated by the sequential thermal evaporation of gold, copper phthalocyanine (CuPc), C_{60} and gold onto sap­phire substrates. When the current-voltage characteristics of a freshly made device are measured in an atmosphere of argon, fairly strong rectification is observed. When the bilayer device is exposed to ammonia vapor, the recti­fication slowly decreases and almost disappears. If the device is then placed under vacuum and the ammonia removed, the initial conditions slowly re­turn. We attribute the rectification to the formation of a p-n junction.
6
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Magnetic Properties of Crystalline NiFe Alloy Prepared by High-Energy Ball Milling and Compacting

88%
Olekšáková D., Kollár P., Füzer J., Bednarčík J., Roth S.
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issue 5
797-799
EN
The structure and magnetic properties of compacted microcrystalline NiFe (81 wt% of Ni) powder is investigated. The powder of NiFe alloy prepared by ball milling of ribbon (prepared by melt spinning) remains single phase material suitable for compaction in order to prepare soft magnetic material. The bulk samples were consolidated by uniaxial compaction of the powder in vacuum. By measuring of AC and DC magnetic properties it was found out that in bulk samples the displacement of domain walls is the dominant magnetization process, while rotation of magnetization vectors prevails in powder material.
7
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The Soft Magnetic Properties and Temperature Stability of Co-Fe-Zr-B Metallic Glasses

76%
Bednarčík J., Kováč J., Roth S., Fűzer J., Kollár P., Varga L., Franz H.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
83-86
EN
In the present work multicomponent Co-based alloys with nominal composition Co_{72-x}Fe_xZr_8B_{20} (x=10, 15, and 20 at. %) were synthesized by single-roller melt-spinning. The measurement of coercivity, H_c, reveals the soft magnetic behavior of investigated alloys. The value of H_c increases from 23 A/m for alloy with x=10 at. % up to 32 A/m for alloy with x=20 at. %. Further it was found that crystallization temperature of as-quenched alloys slightly varies with iron content and lays between 605 and 625°C. From the temperature dependence of magnetization it follows that partial substitution of cobalt by iron has positive influence on the Curie temperature of amorphous phase, T^{am}_c, which increases from 300°C up to 462°C for alloy with x=10 at. % and x=2 0 at. %, respectively.
8
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Fabrication and Characterization of Hybrid Tunnel Magnetoresistance Structures with Embedded Self-Assembled Nanoparticle Templates

52%
Siffalovic P., Majkova E., Chitu L., Halahovets Y., Jergel M., Senderak R., Luby S., Weis M., Satka A., Szymański B., Stobiecki F., Timmann A., Roth S.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
332-335
EN
We report on an incorporation of self-assembled templates of superparamagnetic Fe-O nanoparticles into tunnel magnetoresistance devices. We fabricated a multilayer stack composed of the following layer sequence: Cr/Au/Co/NP/Co/Cu on Si(100) substrate where NP stands for a self-assembled layer of nanoparticles deposited by the Langmuir-Blodgett technique. The X-ray reflectivity and grazing-incidence small angle X-ray scattering were employed to study the layers thicknesses and interface morphology in each preparation step. In particular, the grazing-incidence small angle X-ray scattering was measured before and after the nanoparticle incorporation as well as on the complete tunnel magnetoresistance stack. In this way, in-depth morphology profile during subsequent preparation steps was obtained. We demonstrate that X-ray analysis of the deposited tunnel magnetoresistance stack is essential for successful fabrication of novel hybrid devices consisting of self-assembled nanoparticles.
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