Direct Experimental Study of Domain Structure In Magnetic Multilayers

1995 ◽  
Vol 384 ◽  
Author(s):  
V.I. Nikitenko ◽  
V.S. Gornakov ◽  
L.M. Dedukh ◽  
L.H. Bennett ◽  
R.D. McMichael ◽  
...  
Keyword(s):  
Domain Wall ◽  
Polarized Light ◽  
Optical Microscope ◽  
Magnetic Multilayers ◽  
Stray Field ◽  
Yttrium Iron ◽  
Plane Anisotropy ◽  
Light Optical Microscope ◽  
Iron Garnet ◽  
Indicator Film

ABSTRACTWe have applied a polarized light optical microscope in reflective mode with a Bi-substituted yttrium-iron-garnet indicator film with in-plane anisotropy for visualization of the magnetostatic fields produced by nanostructured magnetic CoNiCu/Cu electrodeposited multilayers. By analysis of the magneto-optical stray field image, detailed information is obtained not only on the as-grown multilayer magnetic structure but on its change during the magnetization reversal processes. The influences of crystal lattice defects and nonuniformity of the nonmagnetic spacers thicknesses on the domain wall nucleation and motion are studied. Peculiarities of the re-magnetization of antiferromagnetically exchange coupled multilayers are discussed, including real-time observations of domain wall creep in a constant applied field.

scholarly journals Crystallization Behavior and Mechanical Properties of Poly(ε-caprolactone) Reinforced with Barium Sulfate Submicron Particles

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2368
Author(s):  
Hegoi Amestoy ◽  
Paul Diego ◽  
Emilio Meaurio ◽  
Jone Muñoz ◽  
Jose-Ramon Sarasua
Keyword(s):  
Barium Sulfate ◽  
Thermal Studies ◽  
Polarized Light ◽  
Optical Microscope ◽  
Submicron Particles ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Nucleation Effect ◽  
Crystal Fraction ◽  
Light Optical Microscope

Poly(ε-caprolactone) (PCL) was mixed with submicron particles of barium sulfate to obtain biodegradable radiopaque composites. X-ray images comparing with aluminum samples show that 15 wt.% barium sulfate (BaSO4) is sufficient to present radiopacity. Thermal studies by differential scanning calorimetry (DSC) show a statistically significant increase in PCL degree of crystallinity from 46% to 52% for 25 wt.% BaSO4. Non-isothermal crystallization tests were performed at different cooling rates to evaluate crystallization kinetics. The nucleation effect of BaSO4 was found to change the morphology and quantity of the primary crystals of PCL, which was also corroborated by the use of a polarized light optical microscope (PLOM). These results fit well with Avrami–Ozawa–Jeziorny model and show a secondary crystallization that contributes to an increase in crystal fraction with internal structure reorganization. The addition of barium sulfate particles in composite formulations with PCL improves stiffness but not strength for all compositions due to possible cavitation effects induced by debonding of reinforcement interphase.

Intrinsic pinning of a ferromagnetic domain wall in yttrium iron garnet films with strong uniaxial anisotropy

2005 ◽  
Vol 139 (1-2) ◽  
pp. 65-72 ◽  
Author(s):  
K. S. Novoselov ◽  
S. V. Dubonos ◽  
S. V. Morozov ◽  
E. W. Hill ◽  
I. V. Grigorieva ◽  
...  
Keyword(s):  
Domain Wall ◽  
Yttrium Iron Garnet ◽  
Uniaxial Anisotropy ◽  
Yttrium Iron ◽  
Garnet Films ◽  
Ferromagnetic Domain ◽  
Iron Garnet ◽  
Ferromagnetic Domain Wall

Spectrum of 180° Bloch-type domain-wall excitations in yttrium iron garnet

1993 ◽  
Vol 48 (13) ◽  
pp. 9569-9574 ◽  
Author(s):  
A. V. Mikhailov ◽  
I. A. Shimokhin
Keyword(s):  
Domain Wall ◽  
Yttrium Iron Garnet ◽  
Yttrium Iron ◽  
Iron Garnet

Intrinsic Pinning of a Ferromagnetic Domain Wall in Yttrium Iron Garnet Films with Strong Uniaxial Anisotropy

2005 ◽  
Vol 139 (1) ◽  
pp. 65-72 ◽  
Author(s):  
K. S. Novoselov ◽  
S. V. Dubonos ◽  
S. V. Morozov ◽  
E. W. Hill ◽  
I. V. Grigorieva ◽  
...  
Keyword(s):  
Domain Wall ◽  
Yttrium Iron Garnet ◽  
Uniaxial Anisotropy ◽  
Yttrium Iron ◽  
Garnet Films ◽  
Ferromagnetic Domain ◽  
Iron Garnet ◽  
Ferromagnetic Domain Wall
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