Towards ferrite based rare-earth free permanent magnets: from model systems to new technological applications
Entity
UAM. Departamento de Física de la Materia Condensada; Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia)Date
2017-12-19Subjects
Electromagnetismo - Tesis doctorales; Materiales cerámicos - Tesis doctorales; Metalurgia - Tesis doctorales; FísicaNote
Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física la Materia Condensada y Nanotecnología. Fecha de lectura: 19-12-2017Esta tesis tiene embargado el acceso al texto completo hasta el 19-06-2019
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
Permanent magnets are essential in many applications of very relevant technological areas
(transport, communications technology, energy) and are present in virtually all smart devices.
However, they are not without controversy and have generated in recent years serious economic
and political problems, as well as having important repercussions on the environment. In 2012
the global alarm was raised due to the monopoly derived from the strategic geographical situation
of the so-called rare earths, fundamental constituent elements of these materials. Advances
in nanoscience and nanotechnology are key in the search for alternatives to permanent magnets
based on rare earths. In this sense, and in a general way, this thesis work combines fundamental
studies in nanomagnetism with energetically efficient technological processes in order to be
able to develop permanent magnets free of competitive rare earth of last generation, as well as
to implement new technological applications. To this end, the objectives set out in the present
study have included:
1) The study of rare earth-free magnetic systems exploiting anisotropy, shape and microstructure
in both model systems (epitaxial layers and manganese nanowires) and in isotropic
ferrite powders.
2) The search for general relations to improve / enhance the magnetic properties of rare earthfree
materials based on nanostructured ferrites by effective, reproducible and scalable methods.
3) Understanding and controlling the microstructural effects on the magnetic properties of
treated and refined ferrite isotropic powders.
4) The development of new methodologies to enhance the properties of permanent magnets
based on isotropic ferrite powder, and the prototyping of new applications making use of
the permanent magnets free of developed rare earths.
From the scientific point of view, it is necessary to highlight the microscopic determination of
the magnetization reversal processes in model systems as well as the experimental demonstration
of the generic effects induced by engineered microstructure (tensions and grain size) on
the magnetic properties in processed isotropic powders. From the technological point of view,
to review the development of an efficient, reproducible and scalable methodology to produce
isotropic powder with improved magnetic properties (coercivity and / or (BH)max product) as
well as the design and prototyping of new technological applications..
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Texto de la Tesis Doctoral
Google Scholar:Pedrosa Ruiz, Francisco Javier
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