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5 Acta Physica Polonica A

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Ferromagnetic Resonance Studies of La_{0.67}Ca_{0.33}MnO_3 Film under Stress

100%

Kundys B. , Dyakonov V. , Baran M. , Gierłowski P. , Szymczak R.

Acta Physica Polonica A

2004

tom 105

nr 1-2

133-139

Ferromagnetic resonance spectra of the La_{0.67}Ca_{0.33}MnO_3 ferromagnetic film deposited onto the x-cut LiNbO_3 substrate were investigated in a wide temperature range. The strain was mechanically introduced into the film using a special holder configuration. This leads to a shift of resonance field with respect to that of the as-grown sample. Analysis of the magnetic resonance shift, induced by a mechanical stress, allowed us to determine the magnetostriction constant λ_{100}. The magnetostriction determined in this way versus saturation magnetization could be well described by the Callen and Callen theory suggesting the domination of the single ion crystal field interaction in the sample being in the ferromagnetic state.

Giant Magnetocaloric Effect in Manganites

100%

Szymczak R. , Kolano R. , Kolano-Burian A. , Dyakonov V. , Szymczak H.

Acta Physica Polonica A

2010

tom 117

nr 1

203-206

In this review we briefly discuss the magnetocaloric properties of the manganites. It is evidenced that the maximum entropy change observed in manganites exceeds that of gadolinium (the prototype material for room temperature refrigerators). For the manganites characterized by second-order magnetic phase transitions the scaling hypothesis is discussed. It is shown that simple phenomenological model with only one fitting parameter, presented in this paper, satisfactorily describes experimental observations.

Manifestation of Spin-Glass-Like Behavior in the Organometallic Magnet

72%

Dyakonov V. , Arciszewska M. , Dobrowolski W. , Szewczyk A. , Szymczak H. , Aksymentieva E. , Varyukhin V. , Zubov E. , Gutowska M.

Acta Physica Polonica A

2000

tom 97

nr 5

863-866

Ac susceptibility (χ_{ac}) and dc magnetization (M_{dc}) of the organometallic magnet Na[FeO_{6}(C_{10}H_{8}N)_{3}] have been studied in temperature range of 4.2-200 K, in an external magnetic field up to 16 kOe. Some peculiarities of the χ_{ac} and M _{dc} behavior, which are characteristic of spin-glasses, e.g. cusps in the susceptibility and zero-field-cooled magnetization, an irreversibility between the field-cooled and zero-field-cooled magnetization and dependences of the T_{cusp} temperature on the frequency and the intensity of the magnetic field, were observed at low temperatures.

Pinning Force in Superconducting Wires Nb-Ti

72%

Gajda D. , Zaleski A. , Dyakonov V. , Matrosov N. , Szymczak H. , Beloshenko V. , Spuskanyuk V. , Chishko V.

Acta Physica Polonica A

2010

tom 118

nr 2

364-365

In the paper we present the results of the measurements of critical current I_{c} in NbTi wires. Experiments were made for the wires of 0.3 mm in diameter and the length of 25 mm. The wires were produced by means of two methods: conventional (hydroextrusion and drawing) and preliminary equal channel multiple angle pressing. The samples were heat treated at different temperatures. We describe the influence of different pinning centers on critical current density J_{c}.

Origin of Magnetic Anisotropy of Gd_{5}Si_{2}Ge_{2} Compound

72%

Szymczak R. , Kolano R. , Kolano-Burian A. , Hawelek L. , Krzymanska B. , Aleshkevich P. , Dyakonov V. , Szymczak H.

The second-order anisotropy constant K_2 in polycrystalline Gd_5Si_2Ge_2 giant magnetocaloric material was measured as a function of temperature by the modified singular point detection technique. Although the structural, electrical, thermal, magnetic and magnetocaloric properties of the Gd_5Si_2Ge_2 have been rather well investigated experimentally, magnetic anisotropy of this system is almost unknown. The singularity indicating the anisotropy field was determined analyzing ac susceptibility data taking into account several features of the magnetization curve. The temperature dependence of the anisotropy fields was measured from 4.2 K up to the Curie temperature. The observed relationship between K_2 (T)/K_2 (0) and magnetization M (T)/M (0) was explained assuming dipolar origin of magnetic anisotropy of Gd_5Si_2Ge_2 compound.

Crystalline Structure of Potassium Holmium Double Tungstate

51%

Borowiec M. , Dyakonov V. , Woźniak K. , Dobrzycki Ł. , Majchrowski A. , Michalski E. , Zubov E. , Khatsko E. , Zayarnyuk T. , Szewczyk A. , Gutowska M. , Rykova A. , Barański M. , Domukhovski V. , Shtyrkhunova V. , Iwanowski P. , Żmija J. , Szymczak H.

Acta Physica Polonica A

2011

tom 119

nr 6

835-837

The potassium holmium double tungstate was prepared by using top seeded solution growth technique. Structural investigations have been performed at room temperature. The KHo(WO_4)_2 single crystal belongs to the monoclinic space group C2/c with the unit-cell parameters: a = 10.624(2) Å, b = 10.352(2) Å, c = 7.5434(15) Å, β = 130.78(3)^{o}, and Z = 4. The atomic coordinates, isotropic and anisotropic displacement parameters and interionic distances for the studied structure were determined.