Multi-segmented Magnetic Nanowires Fabrication and Characterization

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

In this work, nickel-gold multi-segmented magnetic nanowires were grown by electrodeposition in anodized alumina templates. The templates were fabricated by a two step anodization process of aluminum disks in an aqueous solution of oxalic acid. In this process, ordered pores grew in an alumina oxide layer at the exposed aluminum area. Each disk was electropolished before the anodization process and the features at its surface were characterized to assess the effect on the pore ordering. Nickel Watts and gold cyanide electrolyte baths were prepared to electrodeposit pure nickel and gold in the templates. Both solutions response to a range of externally applied voltages was characterized and a threshold voltage above which deposition occurs is reported. Single nanowires were isolated by chemically dissolving the template and dispersed in ethanol. Devices were fabricated with these isolated nanowires in which gold contacts were deposited to measure the resistance. A current pulse setup was implemented in a magnetoresistance system allowing to send current pulses with amplitude as low as 2nA and 50μs width. Magneto resistance measurement were carried out on the single nanowires devices and the effect of current pulses was studied. It was found that distinct resistance states can be achieved by applying a determined current pulse at a constant applied field and that the initial state can be recovered by removing excess charge from the nanowire. Finally, the effect of annealing the nanowires in an air atmosphere at 150°C for 24 hours is studied showing that the nickel sections oxidize and the gold sections remain unchanged.

روابط وملفات

التعريف والنوع

رقم الوثيقة

f40ebf4c-1e4d-4281-b69a-bd3490da585f

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1699887_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":" Jürgen Kosel","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Julian A. Moreno Garcıa","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Multi-segmented Magnetic Nanowires Fabrication and Characterization

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Current Pulses , Cylindrical Nanowires , Magnetoresistance

إشراف وإعداد

الإشراف

Jürgen Kosel

الإعداد

Julian A. Moreno Garcıa

الاقتباسات الببليوغرافية