Observation of subdivided 180° Bloch wall configurations on iron whiskers
Subdivided 180° Bloch walls have been observed on iron whiskers using an improved colloid technique. Under the influence of a magnetic field applied vertical to the surface of a specimen the magne...
Subdivided 180° Bloch walls have been observed on iron whiskers using an improved colloid technique. Under the influence of a magnetic field applied vertical to the surface of a specimen the magne...
Optical constants and associated functions of metastable diamondlike amorphous carbon films in the energy range 0.5–7.3 eV
The complex refractive index N()=n+ik and the complex dielectric constant ()=1+i2 are presented for diamondlike amorphous carbon (a-C) films in the photon energy range 0.5–7.3 eV. The effective ...
The complex refractive index N()=n+ik and the complex dielectric constant ()=1+i2 are presented for diamondlike amorphous carbon (a-C) films in the photon energy range 0.5–7.3 eV. The effective ...
Magnetic viscosity and thermal activation energy
J. Appl. Phys. 59, 4129 (1986); doi:10.1063/1.336671
Issue Date: 15 June 1986
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Magnetic viscosity arises when the activation energy E required to produce a change in mangetization is provided thermally. Activation energy functions for single domain particles and materials with ``strong'' and ``weak'' domain-wall pinning are discussed. The magnetic viscosity parameter Sv, given by kT(![[partial-derivative]](http://scitation.aip.org/stockgif3/part.gif)
E/H)
, where kT is the Boltzmann energy and H is the magnetic field, is shown to be proportional to kT/(v Ms), where Ms is the spontaneous magnetization and v is the activation volume swept out as the energy barrier is overcome. For single domain particles and strong domain-wall pinning the constant of proportionality is one while for weak pinning it is 1/2. The generality of this simple relationship is shown to be independent of the details of the activation model.
Journal of Applied Physics is copyrighted by The American Institute of Physics.
E/H)| History: | Received 5 August 1985; accepted 18 February 1986 |
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BibSonomy
KEYWORDS and PACS
MAGNETIZATION,
VISCOSITY,
MAGNETIC PROPERTIES,
DOMAIN STRUCTURE,
DOMAIN WALL,
MAGNETIC FLUX,
ACTIVATION ENERGY,
MAGNETIC MATERIALS,
FERROMAGNETIC MATERIALS,
WALL PINNING
- 75.60.Ej
Magnetic properties and materials Domain effects, magnetization curves, and hysteresis Magnetization curves, hysteresis, Barkhausen and related effects - 75.60.Lr
Magnetic properties and materials Domain effects, magnetization curves, and hysteresis Magnetic aftereffects - 75.60.Ch
Magnetic properties and materials Domain effects, magnetization curves, and hysteresis Domain walls and domain structure - 75.30.Cr
Magnetic properties and materials Magnetically ordered materials: other intrinsic properties Saturation moments and magnetic susceptibilities - YEAR: 1986
RELATED DATABASES
PUBLICATION DATA
0021-8979 (print)
1089-7550 (online)
AIP
REFERENCES (10)
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- C. P. Bean and J. D. Livingston,
J. Appl. Phys. 30, 120S (1959 ). - R. Street, J. C. Woolley, and P. B. Smith,
Proc. Phys. Soc. B 65, 679 (1952 ). - P. Gaunt and G. J. Roy,
Philos. Mag. 34, 781 (1976 ). - P. Gaunt, J. Appl. Phys. 48, 3470 (1977).
- C. K. Mylvaganam and P. Gaunt,
Philos. Mag. B 44, 581 (1981 ). - Y. Shimizu, J. Geomagn. Geoelectr. 11, 125 (1960).
- E. P. Wohlfarth,
J. Phys. F 14, L155 (1984 ). - P. Gaunt,
Philos. Mag. B 48, 261 (1983 ). - U. S. Ram, D. Ng, and P. Gaunt,
J. Magn. Magn. Mater. 50, 193 (1985 ). - J. C. Barbier, Ann. Phys. (Paris) 9, 84 (1954).
