CoFe Layers Thickness and Annealing Effect on the Magnetic Behavior of the CoFe/Cu Multilayer Nanowires

در اين كار نانوسيم هاي چند لايه CoFe/Cu بوسيله روش الكتروشيميايي در داخل قالب هاي اكسيد آلومينيومي تهيه شده با فرايند آندايزنرم نشست پيدا كردند. با اين روش نانوسيم هايي با قطر 30 نانومتر و طول مشخص حاصل شدند. تاثير ضخامت لايه هاي CoFe و دماي آنلينگ بر روي خواص مغناطيسي نانوسيم هاي چندلايه بررسي شد. افزايش ضخامت لايه CoFe باعث افزايش كورسيويتي (Hc) و حالت مربعي نمودار CoFe/Cu شد و آنيلينگ باعث بهبود Hc و كاهش حالت مربعي مي شود.

CoFe/Cu multilayer nanowires were electrodeposited into anodic aluminum oxide templates prepared by a two-step mild anodization method, using the single-bath technique. Nanowires with 30 nm diameter and the definite lengths were obtained. The effect of CoFe layers thickness and annealing on the magnetic behavior of the multilayer nanowires was investigated. The layers thickness was controlled through the pulses numbers: 200, 260, 310,360 and 410 pulses were used to deposit the CoFe layers, while 300 pulse for the Cu layers. A certain increase in coercivity and squareness of CoFe/Cu multilayer nanowires observed with increasing the CoFe layer thickness and annealing improved the coercivity and decrease squareness of CoFe/Cu multilayer nanowires. First order reversal curves after annealed showed amount domains with soft magnetic phase, it also shows decreasing spreading of distribution function along the axis after annealed.