Some special cases of the magnetization processes of ferromagnets

Hajko, V.; Daniel-Szabó, J.; Potocký, L.; Zentko, A.

doi:10.1109/tmag.1974.1058312

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…Figure 10 indicates richer BN emission in tangential direction (associated with the direction of cutting speed) than that in the axial direction (associated with the direction of feed speed). Strong magnetic anisotropy is due to unbalance between cutting and feed speeds as a result of stress anisotropy and associated effect of magnetostriction [11].…”

Section: Bn Signals In Tangential Directionmentioning

confidence: 99%

Barkhausen Noise Emission in Milled Surfaces

Neslušan¹,

Hrabovský²,

Čilliková³

et al. 2015

Komunikácie

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This paper deals with the non-destructive evaluation of surface made of roll bearing steel 100Cr6 after milling cycles via Barkhausen noise technique. The paper discusses magnetic anisotropy linked with the structure transformations with regard to variable flank wear of cutting tool. Effective value of Barkhausen noise (BN), Peak Position and Full Width at Half Maximum (FWHM) derived from the raw BN signals are compared with metallographic observations and residual stress profiles. Surface integrity is also expressed in term of surface roughness due to comparable BN sensitive layer and the height of surface roughness profile.

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Section: Bn Signals In Tangential Directionmentioning

confidence: 99%

Barkhausen Noise Emission in Milled Surfaces

Neslušan¹,

Hrabovský²,

Čilliková³

et al. 2015

Komunikácie

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“…Such a transfer occurs as a result of discrete Barkhausen jumps in the magnetization. A jump may cause a magnetization change which is increasing or decreasing with respect to the field (so-called 'negative' Barkhausen jumps, which arise due to changes in magnetization against the field direction, have been widely observed [24,25]). Each Barkhausen discontinuity represents an irreversible degradation of the work value, or free energy of the magnet, and there are accurate experimental measurements which link the occurrence of Barkhausen jumps, and hence the production of entropy, with the onset of hysteresis [25].…”

Section: Entropy In Permanent Magnetsmentioning

confidence: 99%

A thermodynamic model for magnetization kinetics in permanent magnets

Thompson

Street

1996

J. Phys. D: Appl. Phys.

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We develop a phenomenological, computation model based on a system of interacting spin-pairs to examine the thermodynamics of magnetization kinetics in permanent magnets. In particular, we examine the evolution of the system across the magnetic Gibbs free energy surface, at constant field and temperature (viscosity conditions), from different non-equilibrium starting configurations. Under viscosity conditions, the system will converge to either the (single) local free energy minimum, if it exists, or the global minimum. The Gibbs free energy will decrease monotonically along a convergence path, but the model shows clearly that there is no such constraint on the internal energy, the entropy or the magnetization.

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“…-On observe de temps en temps des sauts irr6versibles qui font varier l'aimantation en sens inverse de la variation du champ. Les sauts inverses d'aimantation ont d6jd ete mis en evidence sur des 6chantillons ferromagn6tiques varies : fer-silicium monocristallin, fer-carbonyle, nickel, permalloy [10,11], fer-silicium polycristallin [12], nickel-fer monocristallin en couches minces [13]. 11 semble donc qu'il s'agisse d'un phenomene tres general.…”

Section: Sauts D'aimantation Inverses (Cadres a Et Bunclassified

“…Les extremites sup6rieures et inferieures des cycles se d6placent respectivement de -8,1 gauss (A1 A6) et 18,5 gauss (B1 B6), puis de -6,8 gauss (A44 A47) et 7,4 gauss (B44 B46). L'ecart entre les deux trajets limites est de 11,6 gauss (A6 A47)- 5. Interpr6tation des sequences de sauts.…”

Section: Tableau IVunclassified

Sauts irréversibles d'aimantation dans des structures en domaines simples

Porteseil

Vergne

1976

J. Phys. France

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Les auteurs étudient les séquences de sauts de Barkhausen dans des cadres mono-cristallins de fer-silicium contenant un petit nombre de parois de Bloch à 180°. Ils utilisent une technique d'asservissement de la vitesse de variation du flux magnétique. On peut ainsi explorer les régions instables du cycle d'hystérésis et contrôler la vitesse à laquelle se déroulent les séquences de sauts. On met également en évidence les sauts dus au traînage de fluctuations thermiques. Dans un diagramme champ-induction, on reconstitue la chronologie de séquences où apparaissent les phénomènes de bascule et de sauts inverses. On compare ces diagrammes avec les résultats obtenus en simulant électroniquement un ensemble discret de grains de Preisach couplés. On constate que l'agitation thermique oriente les séquences de façon partiellement aléatoire, et on précise cette notion dans le cas particulier très simple de deux parois couplées

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Some special cases of the magnetization processes of ferromagnets

Cited by 8 publications

References 19 publications

Barkhausen Noise Emission in Milled Surfaces

Barkhausen Noise Emission in Milled Surfaces

A thermodynamic model for magnetization kinetics in permanent magnets

Sauts irréversibles d'aimantation dans des structures en domaines simples

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