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1
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Selective Modification of Magnetic Properties of Co_1 /Au/Co_2/Au Multilayers by He Ion Bombardment

100%
Urbaniak M., Stobiecki F., Engel D., Szymański B., Ehresmann A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
326-328
EN
We show that in a [Co_1/Au/Co_2/Au]_4 multilayer, where Co_{1(2)} denote Co layers of different thicknesses, a 10 keV He-ion bombardment with a 6×10^{14} ions cm^{-2} dose leads to changes of the easy direction from out-of-plane to in-plane in the thicker Co layers (t_{Co2} = 1 nm) while the perpendicular anisotropy of the thinner Co layers (t_{Co1} = 0.6 nm) is preserved. The investigated multilayers were obtained by sputtering and the thickness of the Au layers (t_{Au} = 4 nm) ensured that a direct coupling between the Co layers (through pinholes) and Ruderman-Kittel-Kasuya-Yosida-like interactions were negligible.
2
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Hard and Soft X-Ray Reflectivity Studies οf (NiFe/Au/Co/Au)_{10} Magnetic Multilayers

73%
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.
3
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Domains Stimulated Magnetostatic Coupling in NiFe/Au/Co/Au Multilayers Investigated by Complementary Methods

59%
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.
4
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Magnetic Tailoring of Domains in NiFe/Au/Co/Au Multilayers by He Ion Bombardment through Nanospheres

59%
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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