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Open Access Nano Express

Hysteresis loops of individual Co nanostripes measured by magnetic force microscopy

Miriam Jaafar1, Luis Serrano-Ramón23, Oscar Iglesias-Freire1, Amalio Fernández-Pacheco234, Manuel Ricardo Ibarra234, Jose Maria De Teresa234 and Agustina Asenjo1*

Author Affiliations

1 Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, 28049, Spain

2 Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Zaragoza, 50009, Spain

3 Departamento de Física de la Materia Condensada, Universidad de Zaragoza-CSIC, Zaragoza, 50009, Spain

4 Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Zaragoza, 50009, Spain

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Nanoscale Research Letters 2011, 6:407  doi:10.1186/1556-276X-6-407

Published: 2 June 2011

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.