About

The Instituto de Ciencia de Materiales de Madrid (ICMM) is an institute of the Consejo Superior de Investigaciones Cientificas (CSIC) (Spanish National Research Council) founded in December 1986, that belongs to the Area of Science and Technology of Materials, one of the eight Areas in which the CSIC divides its research activities.

 

Our mission is to create new fundamental and applied knowledge in materials of high technological impact, their processing and their transfer to the productive sectors at local, national and European scales (the true value of materials is in their use), the training of new professionals, and the dissemination of the scientific knowledge.

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Forthcoming Events

MAY23/09:30

5th Magnetism Spring Meeting
C. Muñoz, M. Vazquez  read more

MAY31/12:00

Spin-orbital interplay in iron superconductors
Belén Valenzuela  read more

JUN04/12:00

A review of Defects in Metal Dichalcogenides: Doping, Alloys, Interfaces, Vacancies and Their Effects in Catalysis & Optical Emission
Mauricio Terrones  read more

News

Nanoscale ha seleccionado para su portada el artículo "Simultaneous assembly of van der Waals..." de A. Castellanos, ICMM, et al.

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Magnetization pinning in modulated nanowires: from topological protection to the “corkscrew” mechanism

Jose Angel Fernandez-Roldan, Rafael Perez del Real, Cristina Bran, Manuel Vazquez and Oksana Chubykalo-Fesenko

Diameter-modulated nanowires offer an important paradigm to design the magnetization response of 3D magnetic nanostructures by engineering the domain wall pinning. With the aim to understand its nature and to control the process, we analyze the magnetization response in FeCo periodically modulated polycrystalline nanowires varying the minor segment diameter. Our modelling indicates a very complex behavior with a strong dependence on the disorder distribution and an important role of topologically non-trivial magnetization structures. We demonstrate that modulated nanowires with a small diameter difference are characterized by an increased coercive field in comparison to the straight ones, which is explained by a formation of topologically protected walls formed by two 3D skyrmions with opposite chiralities. For a large diameter difference we report the occurrence of a novel pinning type called here the “corkscrew”: the magnetization of the large diameter segment forms a skyrmion tube with a core position in a helical modulation along the nanowire. This structure is pinned at the constriction and in order to penetrate the narrow segments the vortex/skyrmion core size should be reduced.

Nanoscale, 2018

The geometry of the simulated nanowire. (a–c) Hysteresis loops obtained for three disorder distributions, labelled 1–3 respectively and for minor constriction diameters 40, 80 and 100 nm. (d) Switching field as a function of minor diameter for the three distributions.

ICMM-2018 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain. Tel: +34 91 334 9000. info@icmm.csic.es