Post-processing Routes for Design of Giant Magnetoimpedance Response and Domain Wall Dynamics Control in Glass-coated Magnetic Microwires

215 p.En esta tesis se presenta el estado actual del arte en la producción, propiedades y aplicaciones demicrohilos magnéticos recubiertos de vidrio junto con las técnicas experimentales empleadas para laproducción y caracterización de los materiales estudiados se tratan efectos novedosos en microhilosmagnéticamente blandos recubiertos de vidrio. El trabajo se enfoca en: i) microhilos amorfos ricos en Fecon tratamiento térmico optimizado para la mejora del efecto de magnetoimpedancia gigante (GMI) ydinámica de pared de dominio mejorada; ii) microhilos amorfos a base de Fe y Co con anisotropíamagnética graduada; y iii) Microhilos basados en Co con efecto conjunto de alto GMI y rápidapropagación de pared de dominio único. La última sección está dedicada a la nueva posibilidad deaplicación de microhilos recubiertos de vidrio en compuestos inteligentes con microhilos integrados

Entrenamiento en habilidades sociales y responsabilidad social corporativa: estudio de un caso

Este artículo evalúa la eficacia de un entrenamiento en habilidades sociales para la adquisición y mejora de destrezas de comunicación requeridas en la implantación y desarrollo de estrategias de responsabilidad social corporativa en una PYME (Pequeña y Mediana Empresa). Se utilizó un diseño cuasi-experimental con medidas pre-post de un entrenamiento en el que participaron 56 directivos y mandos intermedios de la mencionada empresa, mientras que el grupo de comparación estuvo conformado por 28 trabajadores de igual empleo en otra empresa del mismo sector productivo y composición demográfica similar. Los resultados demostraron que después del entrenamiento los participantes obtuvieron puntuaciones medias más altas que antes del mismo en una escala de adopción de la perspectiva del “otro” y en una de interés empático. Asimismo obtuvieron promedios más elevados después del entrenamiento que los obtenidos por el grupo de comparación en ambas variables así como en una medida de heteroevaluación mediante un diferencial semántico sobre empatía. Se discuten los resultados y sus implicaciones prácticas para la implantación y desarrollo de estrategias de responsabilidad social.This paper addresses the effectiveness of social skills training for the acquisition and improvement of communication skills required in the implementation and development of corporate social responsibility strategies in a SME (Small and Medium Enterprise). A quasi-experimental pre-post design was used, in which 56 senior and middle managers of such enterprise were trained (experimental group), while the comparison group was composed by 28 workers in the same job position at another company in the same productive sector and similar demographic composition. Results showed that scores of trained participants in both adoption of the other-party perspective and empathetic interest scales were higher after than before training. Their scores after training were also higher than those obtained by the comparison group in both variables as well as on an empathy heteroevaluation measure based on semantic differential. Findings and its practical implications for implementing and developing social responsibility strategies are discussed

Estudio de pericias psicológicas en casos que involucran a personas que integran poblaciones indígenas en la provincia de Salta

El presente trabajo consistió en la ejecución de un proyecto de intervención denominado: “Estudio de pericias psicológicas en casos que involucran a personas que integran poblaciones indígenas en la provincia de Salta, mediante estrategias pedagógicas didácticas con estudiantes de la carrera de Lic. en psicología de la Universidad Católica de Salta”. Le precedió un proyecto originalmente planificado para ser llevado a cabo en el mes de abril de 2020 de manera presencial, pero el contexto sanitario suscitado por el virus COVID-19 hizo que fuera preciso readaptarlo para la modalidad virtual y pudiera concretarse en el mes de octubre del mismo año. La metodología de trabajo empleada consistió en aula taller, adoptando un diseño predominantemente cualitativo, enmarcado en una perspectiva interpretativa por medio del desarrollo de cuatro encuentros sincrónicos (de frecuencia semanal) que contaron con la participación de profesionales especialistas y de trabajos asincrónicos (individuales y grupales) con un grupo de nueve estudiantes (voluntarios) del último año de la carrera referida. El objetivo del proyecto de intervención fue promover procesos de visibilización, problematización y reflexión en torno a la práctica pericial psicológica con poblaciones indígenas, en los participantes (quienes cumplían el requisito de haber cursado la cátedra de Psicología Forense). Se planificó un proyecto basado en instrumentos de evaluación y fuentes de información consistente en entrevistas (individuales y grupal), cuestionarios de evaluación, fuentes documentales digitales y observación de los encuentros sincrónicos grabados. Los datos fueron analizados de forma cualitativa, triangulando la información, mediante el control cruzado entre las diferentes fuentes. A partir de la propuesta se estimó establecer las bases para el desarrollo de nuevas investigaciones, intervenciones y formaciones que permitan continuar profundizando en este tema y otros vinculados. The present investigation consisted in the execution of an intervention Project called: “Study of psychological expertise in cases involving people who integrates natives populations in the province of Salta, through educational pedagogical strategies with students of the Bachelor´s degree in psychology of UCASAL”. It was preceded by a Project originally planned to take place in the month of April of 2020 in the presently way, but the sanitary context raised by the COVID-19 virus made it readapted for virtual modality and concreted in the month of October of the same year. The work methodology used consisted in a workshop classroom, adopting a predominantly quality design, framed in an interpretative perspective through the development of four synchronous encounters (weekly frequency) that counted with the participation of specialist professionals and asynchronous Works (individual and group) with a group of nine students (volunteers) from the last year of the noun career. The objective of the intervention Project was to promote process of visibility, problematization and reflection around the psychological expertise practice with native populations, in the participants (who full filled the request of having attended the chair of Forensic Psychology). It was planted a project based on evaluation instruments and information sources consistent in interviews (individual and group), questionnaires of evaluation, digit documents sources and the observation of the recorded synchronous encounters. The data was analyzed in a qualitative shape, triangulating information through the cross control of the different sources. From the proposal it was estimated to stablish the bases for the development of new investigations, interventions and formations that allows to continue in this subject and others related in a deeper way.Fil: Corte, Facundo León. Universidad Católica de Salta. Facultad de Artes y Ciencias; Argentina.Fil: García, Lorena Romina. Universidad Católica de Salta. Facultad de Artes y Ciencias; Argentina

Individual skyrmion manipulation by local magnetic field gradients

Magnetic skyrmions are topologically protected spin textures, stabilised in systems with strong Dzyaloshinskii-Moriya interaction (DMI). Several studies have shown that electrical currents can move skyrmions efficiently through spin-orbit torques. While promising for technological applications, current-driven skyrmion motion is intrinsically collective and accompanied by undesired heating effects. Here we demonstrate a new approach to control individual skyrmion positions precisely, which relies on the magnetic interaction between sample and a magnetic force microscopy (MFM) probe. We investigate perpendicularly magnetised X/CoFeB/MgO multilayers, where for X = W or Pt the DMI is sufficiently strong to allow for skyrmion nucleation in an applied field. We show that these skyrmions can be manipulated individually through the local field gradient generated by the scanning MFM probe with an unprecedented level of accuracy. Furthermore, we show that the probe stray field can assist skyrmion nucleation. Our proof-of-concepts results pave the way towards achieving current-free skyrmion control

Development of Magnetic Microwires for Magnetic Sensor Applications

Thin magnetic wires can present excellent soft magnetic properties (with coercivities up to 4 A/m), Giant Magneto-impedance effect, GMI, or rectangular hysteresis loops combined with quite fast domain wall, DW, propagation. In this paper we overview the magnetic properties of thin magnetic wires and post-processing allowing optimization of their magnetic properties for magnetic sensor applications. We concluded that the GMI effect, magnetic softness or DW dynamics of microwires can be tailored by controlling the magnetoelastic anisotropy of as-prepared microwires or controlling their internal stresses and domain structure by appropriate thermal treatment.This work was funded by Spanish MCIU under PGC2018-099530-B-C31 (MCIU/AEI/FEDER, UE) by the Government of the Basque Country under PIBA 2018-44 projectand by the University of Basque Country under the scheme of "Ayuda a Grupos Consolidados" (Ref.: GIU18/192)

Giant magnetoimpedance effect at GHz frequencies in amorphous microwires

Studies of magnetic properties and GMI effect of amorphous Co-Fe rich microwires reveal that they present GMI effect at GHz frequencies. Magnetic field dependences of GMI effect are affected by the post-processing conditions. In particular, we observed that in Co-Fe rich microwires stress-annealing allows improvement of frequency dependence of GMI ratio at high frequencies. We discussed observed experimental dependences considering both different magnetic structure and the anisotropy in the bulk and near the surface and close analogy between giant magnetoimpedance and ferromagnetic resonance.This work was supported by Spanish MCIU under PGC2018-099530-B-C31 (MCIU/AEI/FEDER, UE), by the Government of the Basque Country under PIBA 2018-44 and Elkartek (RTM 4.0) projects and by the University of Basque Country under the scheme of “Ayuda a Grupos Consolidados” (Ref.: GIU18/192). The authors thank for technical and human support provided by SGIker of UPV/EHU (Medidas Magnéticas Gipuzkoa) and European funding (ERDF and ESF

Detection of a magnetic bead by hybrid nanodevices using scanning gate microscopy

open8sìHybrid ferromagnetic(Py)/non-magnetic metal(Au) junctions with a width of 400 nm are studied by magnetotransport measurements, magnetic scanning gate microscopy (SGM) with a magnetic bead (MB) attached to the probe, and micromagnetic simulations. In the transverse geometry, the devices demonstrate a characteristic magnetoresistive behavior that depends on the direction of the in plane magnetic field, with minimum/maximum variation when the field is applied parallel/perpendicular to the Py wire. The SGM is performed with a NdFeB bead of 1.6 μm diameter attached to the scanning probe. Our results demonstrate that the hybrid junction can be used to detect this type of MB. A rough approximation of the sensing volume of the junction has the shape of elliptical cylinder with the volume of ∼1.51 μm3. Micromagnetic simulations coupled to a magnetotransport model including anisotropic magnetoresistance and planar Hall effects are in good agreement with the experimental findings, enabling the interpretation of the SGM images.openCorte-León, H.; Krzysteczko, P.; Marchi, F.; Motte, J.-F.; Manzin, A.; Schumacher, H. W.; Antonov, V.; Kazakova, O.Corte León, H.; Krzysteczko, P.; Marchi, F.; Motte, J. F.; Manzin, Alessandra; Schumacher, H. W.; Antonov, V.; Kazakova, O

Development of Co-Rich Microwires with Graded Magnetic Anisotropy

In this paper, a gradual change in the hysteresis loop of Co-rich glass-coated microwire stress-annealed at variable temperature is observed. Such microwires annealed with a temperature gradient also present a variable squareness ratio and magnetic anisotropy field along the microwire’s length. The obtained graded anisotropy has been attributed to a gradual modification of the domain structure along the microwire originated by a counterbalance between shape, magnetoelastic, and induced magnetic anisotropies. Accordingly, we propose a rather simple route to design graded magnetic anisotropy in a magnetic microwire.This work was funded by and by the EU under “INFINITE” (Horizon 2020) project, by the Spanish MCIU under PGC2018-099530-B-C31 (MCIU/AEI/FEDER, UE), by the Government of the Basque Country under PIBA 2018-44, PUE_2021_1_0009 and Elkartek (CEMAP and AVANSITE) projects, by the Diputación Foral de Gipuzkoa in the frame of Programa “Red guipuzcoana de Ciencia, Tecnología e Innovación 2021” under 2021-CIEN-000007-01 project and by the University of Basque Country under the scheme of “Ayuda a Grupos Consolidados” (Ref.: GIU18/192) and COLAB20/15 project