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Author: Marie-Christine Luche
Publisher:
ISBN:
Category :
Languages : fr
Pages : 168
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Author: Marie-Christine Luche
Publisher:
ISBN:
Category :
Languages : fr
Pages : 168
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Book Description
Author: MARIE-CHRISTINE.. LUCHE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 168
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Book Description
DANS CE MEMOIRE, NOUS ETUDIONS LA STRUCTURE ET LES PROPRIETES MAGNETIQUES DE BICOUCHES ET MULTICOUCHES COMPOSEES D'UNE TERRE RARE (DYSPROSIUM, HOLMIUM) ET DE ZIRCONIUM ET TENTONS D'ETABLIR UNE RELATION ENTRE LES CARACTERISTIQUES STRUCTURALES ET LE COMPORTEMENT MAGNETIQUE DE CES ECHANTILLONS. LES ECHANTILLONS SONT ELABORES PAR EVAPORATION SOUS ULTRA-VIDE SUR UN SUBSTRAT DE SILICIUM. APRES AVOIR OPTIMISE LES PARAMETRES DE DEPOT (VITESSE DE DEPOT, TEMPERATURE DU SUBSTRAT...), NOUS AVONS REALISE DES BICOUCHES ET MULTICOUCHES TERRE RARE/ZIRCONIUM DE DIFFERENTES EPAISSEURS. L'ANALYSE DES ECHANTILLONS EN DIFFRACTION DE RAYONS X ET PAR MICROSCOPIE ELECTRONIQUE EN TRANSMISSION REVELE UNE STRUCTURE GRANULAIRE, FORTEMENT TEXTUREE LE LONG DE LA DIRECTION DE CROISSANCE MAIS SANS ORIENTATION PREFERENTIELLE DANS LE PLAN DES COUCHES. LA MAILLE DE LA TERRE RARE EST COMPRIMEE DANS LE PLAN DE BASE. LA LARGEUR DES INTERFACES ENTRE LA TERRE RARE ET LE ZIRCONIUM A ETE ESTIMEE A 1 OU 2 DISTANCES INTER-RETICULAIRES. LES MESURES D'AIMANTATION REALISEES SUR LES MULTICOUCHES A L'AIDE D'UN MAGNETOMETRE A SQUID ONT PERMIS DE METTRE EN EVIDENCE DES PROPRIETES INTERESSANTES, COMME LES MODIFICATIONS DU DIAGRAMME DE PHASES MAGNETIQUES DE LA TERRE RARE EN MULTICOUCHE ATTRIBUEES AUX EFFETS DES DEFORMATIONS INDUITES PAR LES CONTRAINTES DE CROISSANCE. LES PHENOMENES D'IRREVERSIBILITE THERMIQUE ET LES IMPORTANTES COERCIVITES OBSERVES SUR CES ECHANTILLONS SONT RELIES AUX FORTS CHAMPS D'ANISOTROPIE QUI REGNENT AU NIVEAU DES INTERFACES ET DES JOINTS DE GRAINS. L'ANISOTROPIE MAGNETIQUE D'INTERFACE DES MULTICOUCHES EST SUFFISANTE POUR COMPENSER L'ANISOTROPIE MAGNETOCRISTALLINE DE VOLUME LORSQUE L'EPAISSEUR DE LA COUCHE DE TERRE RARE EST VOISINE DE 10 ANGSTROMS. UN MODELE DE CHARGES PONCTUELLES EST UTILISE POUR ESTIMER L'ANISOTROPIE MAGNETIQUE DANS CES ECHANTILLONS ET SUGGERE QU'UN CERTAIN DESORDRE AU NIVEAU DE L'INTERFACE EST NECESSAIRE POUR INDUIRE UNE COMPENSATION DE L'ANISOTROPIE DE VOLUME PAR L'ANISOTROPIE D'INTERFACE
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 552
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Author: Evgeny Y. Tsymbal
Publisher: OUP Oxford
ISBN: 0191642223
Category : Science
Languages : en
Pages : 416
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Book Description
This book is devoted to the rapidly developing field of oxide thin-films and heterostructures. Oxide materials combined with atomic-scale precision in a heterostructure exhibit an abundance of macroscopic physical properties involving the strong coupling between the electronic, spin, and structural degrees of freedom, and the interplay between magnetism, ferroelectricity, and conductivity. Recent advances in thin-film deposition and characterization techniques made possible the experimental realization of such oxide heterostructures, promising novel functionalities and device concepts. The book consists of chapters on some of the key innovations in the field over recent years, including strongly correlated oxide heterostructures, magnetoelectric coupling and multiferroic materials, thermoelectric phenomena, and two-dimensional electron gases at oxide interfaces. The book covers the core principles, describes experimental approaches to fabricate and characterize oxide heterostructures, demonstrates new functional properties of these materials, and provides an overview of novel applications.
Author: C. G. Shull
Publisher:
ISBN:
Category : Diffraction
Languages : en
Pages : 8
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Author: Gan Fuxi
Publisher: CRC Press
ISBN: 9814613207
Category : Science
Languages : en
Pages : 730
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Book Description
In the big data era, data storage is one of the cores in the whole information chain, which includes production, transfer, sharing, and finally processing. Over the years, the growth of data volume has been explosive. Today, various storage services need memories with higher density and capacity. Moreover, information storage in the big data applic
Author: David Adler
Publisher: Springer Science & Business Media
ISBN: 1489922601
Category : Science
Languages : en
Pages : 448
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Book Description
The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Author: I. A. Campbell
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 252
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Book Description
