scholarly journals Interaction between Magnetic Domain Walls and Antiphase Boundaries in Ni2Mn(Al,Ga) Studied by Electron Holography and Lorentz Microscopy

2007 ◽  
Vol 48 (10) ◽  
pp. 2636-2641 ◽  
Author(s):  
T. Yano ◽  
Y. Murakami ◽  
R. Kainuma ◽  
D. Shindo
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Electron Holography ◽  
Antiphase Boundaries ◽  
Lorentz Microscopy ◽  
Magnetic Domain Walls

scholarly journals Aberration Corrected Lorentz Microscopy to Investigate Magnetic Domain Walls in Co-Pt Nano-Chessboards

2017 ◽  
Vol 23 (S1) ◽  
pp. 454-455 ◽  
Author(s):  
Isha Kashyap ◽  
Jerrold A. Floro ◽  
Yongmei M. Jin ◽  
Marc De Graef
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Lorentz Microscopy ◽  
Magnetic Domain Walls ◽  
Aberration Corrected

Direct Observation of Fine Structure of Magnetic Domain Walls by Electron Holography.

1980 ◽  
Vol 45 (1) ◽  
pp. 74-74 ◽  
Author(s):  
Akira Tonomura ◽  
Tsuyoshi Matsuda ◽  
Junji Endo ◽  
Tatsuo Arii ◽  
Kazuhiro Mihama ◽  
...  
Keyword(s):  
Fine Structure ◽  
Direct Observation ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Electron Holography ◽  
Magnetic Domain Walls

scholarly journals Magnetic characterization of cobalt nanowires and square nanorings fabricated by focused electron beam induced deposition

2018 ◽  
Vol 9 ◽  
pp. 1040-1049 ◽  
Author(s):  
Federico Venturi ◽  
Gian Carlo Gazzadi ◽  
Amir H Tavabi ◽  
Alberto Rota ◽  
Rafal E Dunin-Borkowski ◽  
...  
Keyword(s):  
Electron Beam ◽  
Domain Walls ◽  
Magnetic Moments ◽  
Magnetic Domain ◽  
Hysteresis Loops ◽  
Electron Holography ◽  
Magnetic Dipoles ◽  
Plane Field ◽  
Magnetic Domain Walls ◽  
Electron Beam Induced Deposition

The magnetic properties of nanowires (NWs) and square nanorings, which were deposited by focused electron beam induced deposition (FEBID) of a Co carbonyl precursor, are studied using off-axis electron holography (EH), Lorentz transmission electron microscopy (L-TEM) and magnetic force microscopy (MFM). EH shows that NWs deposited using beam energies of 5 and 15 keV have the characteristics of magnetic dipoles, with larger magnetic moments observed for NWs deposited at lower energy. L-TEM is used to image magnetic domain walls in NWs and nanorings and their motion as a function of applied magnetic field. The NWs are found to have almost square hysteresis loops, with coercivities of ca. 10 mT. The nanorings show two different magnetization states: for low values of the applied in-plane field (0.02 T) a horseshoe state is observed using L-TEM, while for higher values of the applied in-plane field (0.3 T) an onion state is observed at remanence using L-TEM and MFM. Our results confirm the suitability of FEBID for nanofabrication of magnetic structures and demonstrate the versatility of TEM techniques for the study and manipulation of magnetic domain walls in nanostructures.

Lorentz Microscopy: Effect of Tilting on Magnetic Domains in Single Crystal Iron Films

1968 ◽  
Vol 26 ◽  
pp. 388-389
Author(s):  
L. F. Allard ◽  
A. P. Rowe ◽  
P. L. Fan
Keyword(s):  
Single Crystal ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Objective Lens ◽  
Pole Piece ◽  
Magnetic Domains ◽  
Iron Films ◽  
Lorentz Microscopy ◽  
Magnetic Domain Walls ◽  
Microscopy Techniques

In order to observe magnetic domain walls by Lorentz microscopy techniques it is often necessary either to operate the microscope with the objective lens off, thus severely limiting the magnification, or to move the specimen from its usual position or make some other modification so that the field to which it is subjected is not so strong that it saturates the specimen. However, conditions in the JEM-6A have proved favorable for observation of domains in single crystal iron films by the out-of-focus method without any modifications, using either the regular specimen stage with the small bore pole piece or the tilting stage with the large bore pole piece. The tilting stage is particularly useful for these studies because the domains are very sensitive to small differences in inclination in the field.

Microstruoture-Property Relationships in Magenqubnch Magnets

1987 ◽  
Vol 96 ◽  
Author(s):  
Raja K. Rishra
Keyword(s):  
Melt Spinning ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Processing Parameters ◽  
Second Phase ◽  
Lorentz Microscopy ◽  
Transmission Electron ◽  
Melt Spun ◽  
Magnetic Domain Walls ◽  
Two Phases

ABSTRACTTransmission electron microscopy has been used to characterize the microstructure of Nd-Fe-B magnets produced by melt-spinning and subsequent hot-pressing/die-upsetting. For a material of starting composition Nd.135Fe.815B.05, the basic microstructure od melt-spun, hot-pressed and dieupset magnets consists of two phases. In the optimally processed melt-spun ribbons and hot-pressed samples, small and randomly oriented Nd2Fe14B grains are surrounded by a thin noncrystalline Nd-rlch phase. The die-upset material consists of closely stacked flat Nd2Fe14B grains surrounded by a second phase of approximate composition Nd7Fe3. No Nd11Fe4B4 phase is observed in these materials, but it can form if the chemical composition and/or processing parameters are varied. In all these materials, Lorentz microscopy reveals that magnetic domain walls are pinned by the second phase. The differences in the hard magnetic properties of the three kinds of MAGNEQUENCH magnets closely correlate with the differences in the distribution of Nd2Fe14B crystallites and the pinning sites.

Observations by Lorentz microscopy of movements of magnetic domain walls in amorphous Fe78B13Si9 alloys

1994 ◽  
Vol 133 (1-3) ◽  
pp. 77-81 ◽  
Author(s):  
B. Astie ◽  
M. Fagot ◽  
C. Beraud ◽  
J. Degauque ◽  
E. Ferrara ◽  
...  
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Lorentz Microscopy ◽  
Magnetic Domain Walls

Direct Observation of Fine Structure of Magnetic Domain Walls by Electron Holography

1980 ◽  
Vol 44 (21) ◽  
pp. 1430-1433 ◽  
Author(s):  
Akira Tonomura ◽  
Tsuyoshi Matsuda ◽  
Junji Endo ◽  
Tatsuo Arii ◽  
Kazuhiro Mihama
Keyword(s):  
Fine Structure ◽  
Direct Observation ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Electron Holography ◽  
Magnetic Domain Walls

Electron Holography Studies on Narrow Magnetic Domain Walls Observed in a Heusler Alloy Ni50Mn25Al12.5Ga12.5

2012 ◽  
Vol 22 (16) ◽  
pp. 3434-3437 ◽  
Author(s):  
Hyun Soon Park ◽  
Yasukazu Murakami ◽  
Keiichi Yanagisawa ◽  
Tsuyoshi Matsuda ◽  
Ryosuke Kainuma ◽  
...  
Keyword(s):  
Heusler Alloy ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Electron Holography ◽  
Magnetic Domain Walls
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