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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hysteresis loops of individual Co nanostripes measured by magnetic force microscopy | Jaafar et al. Nanoscale Research Letters 2011 6 407 http www.nanoscalereslett.eom content 6 1 407 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Hysteresis loops of individual Co nanostripes measured by magnetic force microscopy Miriam Jaafar1 Luis Serrano-Ramón2 3 Oscar Iglesias-Freire1 Amalio Fernandez-Pacheco2 3 4 Manuel Ricardo Ibarra2 3 4 Jose Maria De Teresa2 3 4 and Agustina Asenjo1 Abstract High-resolution magnetic imaging is of utmost importance to understand magnetism at the nanoscale. In the present work we use a magnetic force microscope MFM operating under in-plane magnetic field in order to observe with high accuracy the domain configuration changes in Co nanowires as a function of the externally applied magnetic field. The main result is the quantitative evaluation of the coercive field of the individual nanostructures. Such characterization is performed by using an MFM-based technique in which a map of the magnetic signal is obtained as a function of both the lateral displacement and the magnetic field. Background Magnetization reversal in magnetic nanostructures has been theoretically studied for many years 1 but the possibility of empirical studies of the magnetization reversal in nanosized magnets has renewed the interest of the scientific community 2 . The magnetic nanostructures presented here are valuable candidates for the development of different applications such as high-density and high-speed magnetic information storage highspeed magnetic random access memories magnetic sensors and logic devices 3-5 . Such nanostructures present different magnetic behavior as a function of their shape size aspect ratio or distance between adjacent elements 6 . Thus both the study of individual nanoelements and the understanding of the interaction between adjacent magnets are being investigated due to its importance in future technological applications based on highly integrated devices 7 . Another hot topic in magnetism is .
