Author/Authors :
Jafari Fesharaki، M. نويسنده Department of Physics, Payame Noor University, P. O. Box 19395-3697, Tehran, Iran , , Manouchehri، S. نويسنده Department of Nano Physics, Malekashtar University of Technology, Shahinshahr, Esfahan, Iran , , Z. Sadeghi، Z. Sadeghi نويسنده Young Researchers and Elite Club, Roudehen Branch, Islamic Azad University, Roudehen, Iran , , Yousefi، M. H. نويسنده Department of Nano Physics, Malekashtar University of Technology, Shahinshahr, Esfahan, Iran , , Jalajerdi، R. نويسنده Young Researchers and Elite Club, Arak Branch, Islamic Azad University, Arak, Iran ,
Abstract :
چندلايهNi-Co/Cuبا روش نشست الكتريكي از تك الكتروليت و با استفاده از كنترل گالوانوستاتيك بر روز زير لايه ي تيتانيوم تهيه شد. الگوي پراش اشعهX ضخامت نانومتري لايه ها را تاييد كرد. با استفاده از آناليز EDS خلوص لايه ها بررسي شد. مورفولوژي نمونه ها با استفاده از ميكروسكوپ الكتروني روبشي (SEM) مطالعه گرديد. اندازه گيري هاي مقاومت مغناطيسي در دماي محيط و بر اساس مقاومت در مقابل ميدان هاي ±6kOeبه عنوان تابعي از ضخامت لايه هاي Ni-Co و Cu انجام شد. بيشتريم ميزان مقاومت مغناطيسي زماني حاصل شد كه ضخامت هر دو لايه 4 نانومتر بود. چرخه هيسترس نمونه ها در دماي محيط بررسي شده و وابستگي مغناطش Ni-Co/Cuبه دما مطالعه گرديد.
Abstract :
Ni-Co/Cu multilayers have been grown by electrodeposition method
from a single electrolyte (based on Ni(SO4).6H2O, Co(SO4).7H2O,
Cu(SO4) and H3BO3) using galvanostatic control on titanium
sublayers. The X-ray diffraction (XRD) patterns confirmed the
multilayered structure with the nanometer thicknesses. Also, electron
diffraction x-ray (EDX) analysis confirmed the purity of deposited
samples. The morphology of the samples was estimated by scanning
electron microscope (SEM). Magnetoresistance (MR) measurements
were carried out at room temperature for the Ni-Co/Cu multilayers by
measuring the resistivity in a magnetic fields varying between ±6kOe
as a function of the Ni-Co and Cu layer thicknesses; (1 dCu(nm) 4 and
3 dNi-Cu(nm) 5). The Maximum value of giant magnetoresistance
(GMR) was obtained when the Ni-Co and Cu thicknesses were 4.0nm
and 4.0nm respectively. The hysteresis loop of the samples at room
temperature was studied using an alternating gradient force
magnetometer (AGFM). Finally, the temperature dependence of
magnetization for Ni-Co/Cu multilayers; (dNi-Cu(4nm)/dCu(2nm)
and dNi-Cu(3nm)/dCu(3nm)) measured by Faraday balance and
decreasing the magnetization with increasing the temperature
discussed according to electron scattering due to spin fluctuation.
