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T. Luciński,F. Stobiecki,M. Urbaniak 한국자기학회 1999 Journal of Magnetics Vol.4 No.1
The GMR (d_(Cu)) oscillatory behaviour as well as the widths of first and the second antiferromagnetically coupled ranges of the Permalloy (Py=Ni_(83)Fe_(17))/Cu multilayers have been found to be strongly affected not only by the presence of the superparamagnetic/paramagnetic entitles located at the Py/Cu interfaces but mainly by the existence of the magnetic bridges between Py layers. The effectiveness of the magnetic bridges has been found to be temperature dependent, leading to the temperature dependence of the remnant to saturation magnetization ratio (M_R/M_S). We have found that for Py/Cu multilayers with equal Py and Cu layer thicknesses a high field sensitivity of the GMR effect (0.4%/Oe) and negligible hysteresis can be achieved when the number of Py layers decreases from 100 to 6. Sensitivity can be further improved by increasing the Py layers thickness, but the hysterstic effect becomes more pronounced then.
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.
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.
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.