http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
F. Stobiecki,T. Luciński,J. Dubowik,B. Szymański,M. Urbaniak,F. J. Castano,T. Stobiecki 한국자기학회 1998 Journal of Magnetics Vol.3 No.3
The magnetisation behaviour of polycrystalline permalloy/copper multilayers with mixed antiferromagnetic/ferromagnetic coupling was investigated as function of temperature. The results are discussed in a framework of a realistic model of anitferromagnetically coupled layers connected by ferromagnetic pinholes. A microstructure of pinholes (their density and dimensions) was varied either by a proper annealing treatment or by choosing samples with various Cu spacer thicknesses. It was demonstrated that the temperature changes of the net magnetic moment measured in a magnetic field smaller than the saturation field was strongly affected by the composition of the pinholes, their density, cross-sectional area and their lengths.
The Structure, and the Magnetic and Magnetoresistive Characteristics of the Spin Valve Multilayers
T. Stobiecki,M. Czapkiewicz,J. Wrona,W. PowroŸnik,F. Stobiecki 한국자기학회 1998 Journal of Magnetics Vol.3 No.3
In this paper we report the low and high angle diffraction results, and the magnetic and magnetoresistive characteristics of the spin valve multilayer structure prepared by the sputter machine Emerald II in the Balzers Laboratory. The investigated system consists of a ferromagnetic free layer (7 ㎚ NiFe) and a ferromagnetic pinned layer (7 ㎚ NiFe), separated from each other by a nonmagnetic (2.1 ㎚ Cu) spacer. The NiFe pinned layer is fixed by the exchange coupling with an antiferromagnetic layer (10 ㎚ FeMn). For such system the magnetoresistance ratio ΔR/R=3.58%, the interlayer exchange coupling He=6.4 Oe and the field sensitivity 1.15%/Oe were otained.
Observation of the Domain Structures in Soft Magnetic (Fe97Al₃)85N15 / Al₂O₃ Multilayers
T. Stobiecki,M. Zoladz 한국자기학회 2003 Journal of Magnetics Vol.8 No.1
The longitudinal magnetooptical Kerr effect was used to analyse magnetic domains in soft magnetic (Fe_(97)Al₃)_(85)N_(15)/Al₂O₃ multilayers in order to get microscopic understanding of interlayer exchange coupling. The measuring system consists of a Kerr microscope, a CCIR camera (with an 8-bit framegrabber), 16 bit digital camera and computer system for real-time image processing and to control external magnetic field and cameras. The strength of ferromagnetic (FM) coupling as a function of the spacer thickness of Al₂O₃ was investigated. It was found that strong FM-coupling, strong uniaxial anisotropy and coherent rotation of the magnetization have been observed for the spacer thickness in the range of 0.2 ㎚ ≤ t ≤ 1 ㎚, however, weak FM-coupling, patch domains and 360°-walls occur for the spacer thickness of t = 2.5 ㎚. At a spacer thickness of t ≥ 5 ㎚ transition takes place from weak FM-coupling to the decoupled state where complex interlayer interactions and different types of the domain walls were observed.
Influence of ion irradiation on the magnetic properties of Fe/Cr multilayers
F. stobiecki,B. Szymanski,M. Urbaniak,T. Lucinski,J. Dubowik,M. Kopcewicz,J. Jagielski,이영백 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The in uence of Ar-ion irradiation on the microstructure and magnetic properties of Fe/Cr multilayers is studied. An increase in the interface roughness of Fe/Cr multilayers, caused by irradiation with 200 keV Ar ions whose dose exceeds 5 1012 Ar/cm2, is clearly seen by conversion electron Mossbauer spectroscopy (CEMS). This modication of the microstructure induces distinct changes in the magnetization reversal (an increase in remanence magnetization and a decrease in saturation eld), and greatly reduces the giant magnetoresistance (GMR) eect on increasing the irradiation dose. An enhanced immunity of the GMR eect to the ion irradiation on increasing the thickness of Cr layers, as well as correlation between the changes of GMR and the antiferromagnetically coupled fraction, suggests that the main eect responsible for the decrease in GMR is the formation of pinholes. The temperature dependence of remanence magnetization conrms increases in pinhole density and size during implantation. However, for doses exceeding 2 1013 Ar/cm2, volume intermixing seems to be a dominant mechanism responsible for the further degradation of GMR and the antiferromagnetic interlayer exchange coupling.
GMR in Multilayers with an Alternating In - plane and Perpendicular Anisotropy
F. Stobiecki,B. Szymański,T. Luciñski,J. Dubowik,M. Urbaniak,K. Röll,J. B. Kim,K. W. Kim,Y. P. Lee 한국자기학회 2004 Journal of Magnetics Vol.9 No.2
The magnetic properties of sputtered (Ni_(83)Fe_(17)/Au/Co/Au) multilayers with various thicknesses of Au (0.5 ≤ t_(Au) ≤ 3 ㎚), Ni-Fe (1 ≤ t_(Ni-Fe) ≤ 4 ㎚) and Co (0.2 ≤ t_(Co) ≤ 1.5 ㎚) layers were characterized. An alternating inplane and out-of-plane anisotropy of the ferromagnetic layers was achieved for the structures (t_(Au)≥ 1.5 ㎚) showing a weak coupling between the Ni-Fe layers with an in-plane anisotropy and the Co layers (0.3 ≤ t_(Co) ≤ 1.2 ㎚) with a perpendicular anisotropy. For such a structure, a detailed discussion on the GMR effect is presented, relating to the magnetization reversal from a mutually perpendicular magnetic configuration at the remanence to a parallel one at the saturation. An influence of the dense labyrinth domain structure on the magnetoresistance effect is also addressed.
Enhanced spin-wave damping in exchange-biased films
Janusz Dubowik,F. Stobiecki,I. Goscianska,이영백,A. Paetzold,K. Roll 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The temperature dependencies of the ferromagnetic resonance (FMR) linewidth and the resonance eld shift have been investigated for NiO/NiFe exchange biased bilayers from 78 K to 500 K. A broad maximum in the linewidth at 500 Oe, solely due to the exchange-bias, is observed at 150 K when the magnetic eld is applied along the lm plane. When the magnetic eld is applied perpendicular to the lm plane, the maximum in the linewidth is less pronounced and amounts to be 100 Oe at the same temperature. Such a behavior of the FMR linewidth is accompanied by a monotonic increase in the negative resonance eld shift with decreasing temperature. Our results are compared with the previous experimental FMR and Brillouin light scattering data for various ferromagnetic/antiferromagnetic (FM/AF) structures, and suggest that spin dynamics (spin-wave damping and anomalous resonance eld-shift) in the FM/AF structures can be described in a consistent way by a single mechanism of so-called slow relaxation.