tailieunhanh - Báo cáo hóa học: " Magnetization reversal of Co/Pd multilayers on nanoporous templates"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Magnetization reversal of Co/Pd multilayers on nanoporous templates | Huang et al. Nanoscale Research Letters 2012 7 41 http content 7 1 41 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Magnetization reversal of Co Pd multilayers on nanoporous templates Chien-Chih Huang1 Chin-Chung Yu1 Shih-Yuan Chen2 Yeong-Der Yao3 and Jun-Yang Lai4 Abstract By making use of an e-beam deposition system the Co 2 Ằ Pd 10 Ằ 15 multilayers were prepared on a Si 100 substrate and anodized aluminum oxide AAO templates with average pore diameters of around 185 95 and 40 nm. The mechanism of magnetization reversal of the Co Pd multilayers was investigated. Wall motion was observed on the Co Pd multilayers grown on the Si substrate. A combination of wall motion and domain rotation was found in the sample grown on the AAO template with a 185-nm pore diameter. For the samples grown on the AAO templates with pore diameters of around 95 and 40 nm the reversal mechanism was dominated by domain rotation. The rotational reversal was mainly contributed from the underlying nanoporous AAO templates that provided an additional pinning effect. PACS magnetic anisotropy nanoporous materials magnetization reversal mechanisms. Keywords Co Pd porous anodized aluminum oxide magnetization reversal Introduction In the last decade patterned magnetic nanostructures have undergone a rapid development because of their potential applications in future high-density magnetic recording media 1-4 . Nowadays the FePt film with L10 phase has received significant attention owing to its excellent magnetic properties presenting large values of the saturation magnetization approximately 1 100 emu cm3 the perpendicular magnetocrystalline anisotropy constant approximately 108 erg cm3 the coercivity and the high environmental stability 5-7 . Another choice for the perpendicular recording is ferromagnetic non-ferromagnetic multilayers. For example Co Pt and Co Pd are also candidates for the perpendicular recording