Contrast in the Electron Microscope due to Stray Magnetic Fields near Single‐Domain Iron Whiskers

1967 ◽  
Vol 38 (3) ◽  
pp. 1301-1303
Author(s):  
J. M. Rodgers
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Single Domain ◽  
Iron Whiskers

Vibration Isolator System for Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 182-183
Author(s):  
K. Ohi ◽  
M. Mizuno ◽  
T. Kasai ◽  
Y. Ohkura ◽  
K. Mizuno ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Environmental Conditions ◽  
Vibration Isolator ◽  
Air Conditioners ◽  
Vibration Isolators ◽  
Large Size ◽  
Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

scholarly journals Larmor Precession and Debye Relaxation of Single-Domain Magnetic Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Zs. Jánosfalvi ◽  
J. Hakl ◽  
P. F. de Châtel
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Analytical Solutions ◽  
Power Dissipation ◽  
Single Domain ◽  
Larmor Precession ◽  
Qualitative Comparison ◽  
Debye Relaxation ◽  
Linearly Polarized ◽  
Exponential Relaxation

The numerous phenomenological equations used in the study of the behaviour of single-domain magnetic nanoparticles are described and some issues clarified by means of qualitative comparison. To enable a quantitativeapplicationof the model based on the Debye (exponential) relaxation and the torque driving the Larmor precession, we present analytical solutions for the steady states in presence of circularly and linearly polarized AC magnetic fields. Using the exact analytical solutions, we can confirm the insight that underlies Rosensweig’s introduction of the “chord” susceptibility for an approximate calculation of the losses. As an important consequence, it can also explain experiments, where power dissipation for both fields was found to be identical in “root mean square” sense. We also find that this approximation provides satisfactory numerical accuracy only up to magnetic fields for which the argument of the Langevin function reaches the value 2.8.

Precessional dynamics of single-domain magnetic nanoparticles driven by small ac magnetic fields

2006 ◽  
Vol 39 (22) ◽  
pp. 4746-4752 ◽  
Author(s):  
Haiwen Xi ◽  
Kai-Zhong Gao ◽  
Yiming Shi ◽  
Song Xue
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Single Domain

Fabrication of Large Melt-textured RE-Ba-Cu-O (RE = Gd, Dy) Superconductors and Their Trapped Magnetic Fields

2000 ◽  
Vol 659 ◽  
Author(s):  
Shinya Nariki ◽  
Naomichi Sakai ◽  
Masato Murakami
Keyword(s):  
Magnetic Fields ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Flux Density ◽  
Field Trapping ◽  
Single Domain ◽  
High Flux ◽  
Ag Addition ◽  
Trapped Field ◽  
Bulk Superconductors

ABSTRACTWe have succeeded in synthesizing RE-Ba-Cu-O (RE = Gd and Dy) bulk superconductors with excellent field trapping properties. Large c-axis oriented single-domain Gd-Ba-Cu-O bulk samples with Ag addition were melt-textured under controlled oxygen partial pressure of 1.0%. The Gd-Ba-Cu-O sample 50 mm in diameter could trap a high flux density of 2.4 T at 77 K. In addition, we measured the trapped field between two Gd-bulks in order to minimize the demagnetizing effect and found that it reached 3.3 T. The single-domain Dy-Ba-Cu-O/Ag bulk 48 mm in diameter was also fabricated in air and its trapped field was 1.9 T at 77 K.

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