Nanocintas de FeCo para aplicaciones en sensores magnéticos y biotecnología
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2017
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26/05/2016
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Universidad Complutense de Madrid
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Uno de los ternas de investigación que mayor interés despierta entre los materiales magnéticos es el estudio de los materiales de baja dimensionalidad. Estos materiales no solo resultan interesantes por sus potenciales aplicaciones tecnológicas sino también por la posibilidad de estudiar nuevos fenómenos físicos que sólo se muestran a escala muy pequeña. La tecnología de fabricación actual permite fabricar nuevos materiales con dimensiones en la escala nanométrica lo que ha hecho surgir nuevas aplicaciones en diversas áreas. El trabajo que se presenta a continuación está relacionado con dos de ellas: los dispositivos magnéticos y la biomedicina. Las técnicas de fabricación de materiales nanoestructurados son muy variadas pudiendo ser tanto físicas como químicas. En el caso de las nanopartículas magnéticas, las técnicas químicas son muy utilizadas en general ya que se puede obtener gran cantidad de material y resultan rnás económicas. Las técnicas físicas, por su parte, permiten la producción de una menor cantidad de material pero pueden trabajar con una amplia variedad de composiciones y permiten un gran control sobre la estructura. La combinación de técnicas de lámina delgada, junto con litografía óptica o electrónica, es un ejemplo de estas últimas. Gracias a ellas se han podido fabricar nanoestructuras complejas como los antiferromagnéticos sintéticos, materiales con varias capas magnéticas que interaccionan magnetostáticamente y que permiten diferentes estados de imanación en ausencia de campo aplicado. Estructuras como éstas son interesantes en áreas como dispositivos magnéticos o biomedicina, en las que sus propiedades pueden dar lugar a nuevas aplicaciones. En este trabajo se plantea el estudio de nanoestructuras magnéticas multicapa con una geometría tal que favorece la presencia de diferentes estados magnéticos en la remanencia. Estas estructuras están orientadas hacia su aplicación en dispositivos magnéticos y tecnología biomédica. El material magnético estudiado ha sido una aleación de FeCo por su gran imanación de cara a favorecer sus posibles aplicaciones. La primera parte del trabajo se centra en la fabricación de láminas delgadas de este material y su caracterización...
Magnetic properties of low dimensional materials are considered one of the main research topics worldwide. These materials are interesting not only for its potential technological applications but also for the possibility of studying new physical phenomena that only appear at a very small scale. Current technology allows manufacturing new materials with dimensions on the nanometer scale which has given rise to new applications in various areas. The work presented below is related to two of them: magnetic devices and biomedicine. Nanomaterials fabrication techniques can be either physical or chemical. Chemical techniques are generally more widely used in the case of magnetic nanoparticles due to the big amount of material that can be obtained and its lower costs. On the other hand, the nanoparticle production using physical techniques is lower, but they allow a wide variety of compositions and have a greater control over the structure. An example of this fabrication technique is the combination of thin film growing techniques with optical or electronbeam lithography. Using these methods, complex nauostructures have been manufactured like synthetic autiferromagnetic devices, that is, materials with several magnetic layers which interact with each other and allow different magnetization states in the absence of an external magnetic field applied. Such structures are of interest in areas like magnetic devices or biomedicine, in which their properties may lead to new applications that do not require a large amount of material. In this work we have studied multilayer magnetic nanostructures with a geometry that favors the presence of different magnetic states in the remanence state. These structures have been fabricated considering their potential applications in magnetic devices and biomedical technology. The magnetic material studied is the FeCo alloy due to its large magnetization, which favors its possible applications. The first part of the work is focused on the fabrication of FeCo thin films and the study of their magnetic and structural characterization...
Magnetic properties of low dimensional materials are considered one of the main research topics worldwide. These materials are interesting not only for its potential technological applications but also for the possibility of studying new physical phenomena that only appear at a very small scale. Current technology allows manufacturing new materials with dimensions on the nanometer scale which has given rise to new applications in various areas. The work presented below is related to two of them: magnetic devices and biomedicine. Nanomaterials fabrication techniques can be either physical or chemical. Chemical techniques are generally more widely used in the case of magnetic nanoparticles due to the big amount of material that can be obtained and its lower costs. On the other hand, the nanoparticle production using physical techniques is lower, but they allow a wide variety of compositions and have a greater control over the structure. An example of this fabrication technique is the combination of thin film growing techniques with optical or electronbeam lithography. Using these methods, complex nauostructures have been manufactured like synthetic autiferromagnetic devices, that is, materials with several magnetic layers which interact with each other and allow different magnetization states in the absence of an external magnetic field applied. Such structures are of interest in areas like magnetic devices or biomedicine, in which their properties may lead to new applications that do not require a large amount of material. In this work we have studied multilayer magnetic nanostructures with a geometry that favors the presence of different magnetic states in the remanence state. These structures have been fabricated considering their potential applications in magnetic devices and biomedical technology. The magnetic material studied is the FeCo alloy due to its large magnetization, which favors its possible applications. The first part of the work is focused on the fabrication of FeCo thin films and the study of their magnetic and structural characterization...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Departamento de Física de Materiales, leída el 26/05/2016