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Hard and Soft X-Ray Reflectivity Studies οf (NiFe/Au/Co/Au)_{10} Magnetic Multilayers

100%
Szymański B., Stobiecki F., Weis T., Engel D., Urbaniak M., Kuświk P., Lengemann D., Ehresmann A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
366-368
EN
We report on hard and soft X-ray reflectivity investigations of (Ni_{80}Fe_{20} (2.2 nm)/Au(2.3 nm)/Co(0.8 nm)/Au(2.3 nm))_{10} multilayers. Specular reflectivity curves were measured with Cu K_{α} radiation and circularly polarized synchrotron radiation tuned to Co L_{3} and Ni L_{3} absorption edges. Structural properties of the multilayers were determined from the hard X-ray reflectivity curve. Comparison of reflectivity curves taken at different photon energies shows: (i) small difference in peak positions in dependence of reflectivity versus scattering vector q, (ii) different shapes of satellite Bragg peaks, (iii) different ranges of q for appearance of the Kiessig fringes. Analysis of soft X-ray reflectivity curves taken as a function of magnetic field allows to determine magnetic properties of Co and NiFe layer specifically.
2
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The Influence of He^+ Ion Bombardment on Magnetic Properties of NiFe/Au/Co/Au Multilayers

100%
Kuświk P., Szymański B., Urbaniak M., Stobiecki F., Sveklo I., Kisielewski J., Maziewski A., Jagielski J.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
352-354
EN
The influence of He^+ ion bombardment on magnetoresistance, magnetization reversal and domain structure of sputtered (Ni_{80}Fe_{20}(2 nm)/Au(2 nm)/Co(0.6 nm)/Au(2 nm))_{10} multilayers was investigated. The samples were bombarded using He^+(30 keV) ions with fluences D varied from 10^{13} to 3×10^{16} He^+/cm^{2}. With increasing D the following changes in magnetic properties were observed: (i) exponential decay of the saturation field of Co layers, (ii) progressive decrease in magnetoresistance as a result of degradation of Co layers perpendicular anisotropy, (iii) linear decrease in stripe domain period with log(D).
3
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He⁺ Ion Bombardment Induced Effects on Magnetic Properties of Ni-Fe/Au/Co/Au Films

100%
Kuświk P., Szymański B., Urbaniak M., Dubowik J., Stobiecki F., Kisielewski J., Tekielak M., Maziewski A., Weis T., Ehresmann A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 2
651-656
EN
The influence of He⁺ (10 keV) ion bombardment on magnetic properties of sputter deposited Ni_{80}Fe_{20}/Au/Co/Au layered films was studied. The variable parameters were the thickness of the Co layer or Au spacer and the ion dose. The magnetooptical Kerr measurements were performed on samples with wedge shaped Co or Au layers. With increasing dose of helium ions the following changes in magnetic properties were observed: (i) a decrease in the Co thickness range corresponding to the perpendicular anisotropy, (ii) a decrease in the coercive field (H_C), (iii) an increase in the ferromagnetic coupling between ferromagnetic layers.
4
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Domains Stimulated Magnetostatic Coupling in NiFe/Au/Co/Au Multilayers Investigated by Complementary Methods

81%
Stobiecki F., Urbaniak M., Szymański B., Kuświk P., Schmidt M., Aleksiejew J., Weis T., Engel D., Lengemann D., Ehresmann A., Kopcewicz M.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
345-347
EN
The magnetic structure of Ni_{80}Fe_{20}/Au/Co/Au multilayers characterized by easy-plane and easy-axis perpendicular to the sample plane anisotropies for NiFe and Co, respectively, is strongly modified by magnetostatic coupling resulting from stray fields of stripe domains in the Co layers. Using complementary methods it will be shown that the magnetostatic coupling increases with decreasing Au spacer thickness, with the weakening of the easy plane anisotropy of the NiFe layers and with increasing thickness of the Co layers.
5
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Magnetic Tailoring of Domains in NiFe/Au/Co/Au Multilayers by He Ion Bombardment through Nanospheres

81%
Glapka W., Kuświk P., Sveklo I., Urbaniak M., Jóźwiak K., Weis T., Engel D., Ehresmann A., Błaszyk M., Szymański B., Maziewski A., Stobiecki F.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 1
348-351
EN
Sputter deposited (Ni_{80}Fe_{20}/Au/Co/Au)_{10} multilayers, characterized by alternating in-plane and perpendicular anisotropies of the NiFe and Co layers, respectively, and out-of-plane stripe (labyrinth) domain structure in the Co layers, were bombarded by He^+-ions (10 keV) through a mask consisting of polystyrene nanospheres with a diameter of 470 nm. The changes of multilayers magnetic properties after ion bombardment are correlated with the used mask structure.
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