In-situ lorentz and electron-holography imaging of domain-wall propagation and grain-boundary pinning within anisotropic Nd-Fe-B sintered-magnet thin films

A simplified micromagnetic model has been proposed to calculate the hysteresis loops of nanostructured permanent magnets for various configurations, including thin films, exchange-coupled double-layer systems and bulk materials. The reversal part of the hysteresis is based on the Stoner–Wohlfarth coherent rotational model and the coercivity mechanism is due mainly to the motion of the transition region (a domain wall like magnetic moment distribution in the grain boundary). The elements of nucleation and pinning models are also incorporated.

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In-situ observation of cooperative grain boundary sliding and migration in the nano-twinned nanocrystalline-Au thin-films

Scripta Materialia ◽

10.1016/j.scriptamat.2020.01.025 ◽

2020 ◽

Vol 180 ◽

pp. 97-102 ◽

Cited By ~ 1

Author(s):

Qizhen Li ◽

Lihua Wang ◽

Jiao Teng ◽

Xiaolu Pang ◽

Xiaodong Han ◽

...

Keyword(s):

Thin Films ◽

Grain Boundary ◽

Grain Boundary Sliding ◽

In Situ Observation ◽

Boundary Sliding ◽

Au Thin Films ◽

And Migration

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Control of the magnetic domain wall propagation in Pt/Co/Pt ultra thin films using direct mechanical AFM lithography

Journal of Magnetism and Magnetic Materials ◽

10.1016/s0304-8853(01)00727-2 ◽

2002 ◽

Vol 240 (1-3) ◽

pp. 53-56 ◽

Cited By ~ 6

Author(s):

H.W. Schumacher ◽

D. Ravelosona ◽

F. Cayssol ◽

J. Wunderlich ◽

C. Chappert ◽

...

Keyword(s):

Thin Films ◽

Domain Wall ◽

Magnetic Domain ◽

Magnetic Domain Wall ◽

Domain Wall Propagation ◽

Afm Lithography

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Irreversibility line and low-field grain-boundary pinning in electron-doped superconducting thin films

Journal of Applied Physics ◽

10.1063/1.2402969 ◽

2006 ◽

Vol 100 (12) ◽

pp. 123903 ◽

Cited By ~ 3

Author(s):

S. Sergeenkov ◽

A. J. C. Lanfredi ◽

F. M. Araujo-Moreira

Keyword(s):

Thin Films ◽

Grain Boundary ◽

Irreversibility Line ◽

Superconducting Thin Films ◽

Low Field ◽

Grain Boundary Pinning

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Domain wall propagation in continuous thin films initiated by precessional reversal

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2004.09.035 ◽

2005 ◽

Vol 286 ◽

pp. 51-55 ◽

Cited By ~ 1

Author(s):

M. Kerekes ◽

A.D.C. Viegas ◽

D. Stanescu ◽

U. Ebels ◽

P. Xavier ◽

...

Keyword(s):

Thin Films ◽

Domain Wall ◽

Domain Wall Propagation

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In Situ TEM Analysis of Facet Motion in Gold Σ=3 {112} Boundaries

Microscopy and Microanalysis ◽

10.1017/s1431927600027690 ◽

2001 ◽

Vol 7 (S2) ◽

pp. 324-325

Author(s):

D.L. Medlin

Keyword(s):

Thin Films ◽

Grain Boundary ◽

Microstructural Evolution ◽

Experimental Studies ◽

In Situ Tem ◽

Tem Analysis ◽

Computational Approaches ◽

Boundary Properties ◽

Boundary Curvature

Interfacial anisotropy complicates the prediction of microstructural evolution, particularly ir extreme cases for which the presence of facets and corners prevents the application of classical notions of grain-boundary curvature. Although there has been much effort at incorporating anisotropic grain-boundary properties, including faceted geometries, into computational approaches for microstructural evolution, at present our mechanistic understanding of the behavior of facets anc their junctions remains limited. In this presentation, we investigate the development of faceted boundaries between Σ=3 <111> oriented grains in epitaxially deposited gold thin films. This system is well suited tc experimental studies of facet evolution since the crystallography and structure of the boundaries is already well understood. It is well known that “double-positioning” of epitaxially aligned <111> grains on a surface of three-fold or six-fold symmetry results in a microstructure composed of grains in two twin-related (Σ=3) variants that are separated by facets running vertically through the film and forming 120 degree corners [1,2].

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Domain and lattice contributions to dielectric and piezoelectric properties of Pb(Zrx, Ti1−x)O3 thin films as a function of composition

Journal of Materials Research ◽

10.1557/jmr.1999.0584 ◽

1999 ◽

Vol 14 (11) ◽

pp. 4307-4318 ◽

Cited By ~ 78

Author(s):

S. Hiboux ◽

P. Muralt ◽

T. Maeder

Keyword(s):

Thin Films ◽

Dielectric Properties ◽

Domain Wall ◽

Diffraction Analysis ◽

Piezoelectric Properties ◽

X Ray Diffraction ◽

X Ray ◽

Sputter Deposited ◽

Dielectric And Piezoelectric Properties

In situ reactively sputter deposited, 300-nm-thick Pb(Zrx, Ti1−x)O3 thin films were investigated as a function of composition, texture, and different electrodes (Pt,RuO2).X-ray diffraction analysis, ferroelectric, dielectric, and piezoelectric measurements were carried out. While for dielectric properties bulklike contributions from lattice as well as from domains are observed, domain wall contributions to piezoelectric properties are very much reduced in the morphotropic phase boundary (MPB) region. Permittivity and d33 do not peak at the same composition; the MPB region is broadened up and generally shifted to the tetragonal side.

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Direct Evidence for Grain Boundary Potential Barrier Breakdown via In Situ Electron Holography

Microscopy and Microanalysis ◽

10.1017/s1431927699990499 ◽

1999 ◽

Vol 5 (6) ◽

pp. 428-436 ◽

Cited By ~ 6

Author(s):

Kevin D. Johnson ◽

Vinayak P. Dravid

Keyword(s):

Grain Boundary ◽

Potential Barrier ◽

Electron Holography ◽

Static Case ◽

Electrical Measurements ◽

Applied Current ◽

Boundary Potential ◽

Resolution Electron ◽

Grain Boundary Barrier

Abstract: Static and dynamic grain boundary potential barrier effects are directly observed at high spatial resolution for a varistor of model structure and chemistry. Grain boundary mechanisms for nonlinear electrical behavior are investigated for Nb-doped SrTiO3 bicrystals by in situ high-resolution electron holography under applied current coupled with electrical measurements. For the static case, holography reveals a positive grain boundary barrier of about 0.45 V, which is indicative of positive grain boundary charge adjoined by negative space charge regions. Under high applied current, in situ holography records the breakdown of this grain boundary barrier in accord with the macroscopic varistor effect, which is reflected in bulk I-V experiments.

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