Magnetic After-Effect in Iron due to Motion of Dislocations

Biorci, G.; Ferro, A.; Montalenti, G.

doi:10.1103/physrev.119.653

Cited by 13 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter case is often found in magnetic after-11/16/16 3 effects (e.g. 10 , and some ferroelectric systems, e.g. 11 ), driven by the diffusion of mobile defects to domain walls.…”

Section: Introductionmentioning

confidence: 96%

Aging dynamics in ferroelectric deuterated potassium dihydrogen phosphate

Hecht

Cieszymski

Colla

et al. 2017

Phys. Rev. Materials

View full text Add to dashboard Cite

Anomalously large dielectric aging is found in the high-susceptibility plateau ferroelectric regime of ~95% deuterated potassium dihydrogen phosphate (DKDP). Much less aging is found in non-deuterated KDP. Optical images of the DKDP domain structure show no dramatic change during aging. Small changes in electric field restore the pre-aged susceptibility, but the previous aging almost recovers after returning to the aging field. Susceptibility vs. field can show memory of at least two prior aging fields. Rectifying non-linear susceptibility develops for fields slightly above or below a prior aging field. Aging effects are not fully erased even by brief heating above the Curie point, indicating a role for diffusion of hydrogen to the domain walls, leaving changes in disorder that can survive temporary absence of domain walls. Abrupt random-sign steps in polarization on cooling are accompanied by increases in susceptibility, indicating competition between large-scale domain-wall interaction effects and effects of local interactions with disorder.

show abstract

“…The latter case is often found in magnetic after-11/16/16 3 effects (e.g. 10 , and some ferroelectric systems, e.g. 11 ), driven by the diffusion of mobile defects to domain walls.…”

Section: Introductionmentioning

confidence: 96%

Aging dynamics in ferroelectric deuterated potassium dihydrogen phosphate

Hecht

Cieszymski

Colla

et al. 2017

Phys. Rev. Materials

View full text Add to dashboard Cite

show abstract

“…The disturbing relaxation which is caused by long-range diffusion of intersitials into Bloch walls [23,24] progresses with the time constant ~1~ 10~~. The magnetic counterpart [25,26] of the mechanical K5STER'S relaxation [27] which is due to the interaction of interstitials with disloeations and the magnetie relaxation due to dislocations [1,26,28,29] ate probably also present but they have even longer time constants [26]. All these disturbing relaxations have been eliminated by approximating t-+ o~ with t --10~.…”

Section: Discussionmentioning

confidence: 99%

Measurements of the relaxation processes with a high time constant

Hejnal

1977

Acta Physica

View full text Add to dashboard Cite

A new method is proposed which enables the measurements of the magnetic aftereffect in a temperature range where the customary methods are unrealizable owing to the high time constant of relaxation 9 ~ 104 sec. Its usefulness in the study of very slow processes is illustrated by the measurement of extremely low diffusion coefficients of carbon in bcc iron. This method can be used in an analogous way also for measurements of anelastic relaxation. IntroduetionOHentation magnetie aftereffect originating from the reorientation of anisotropy axis of defects whose symmetry is lower than that of the host lattiee is used inereasingly as an extremely sensitive teehnique for investigating point defects [1]. At present ir is commonly observed as a disaceommodation by using very sensitive and easy-to-handle ac teehniques [2, 3]. The isothermal decrease of the initial susceptibility Z(t) is measured after demagnetization of the specimen asa function of time. As N• theory [4] implies, the corresponding increase of the reluctivity r(t) = 1/•(t) is deseribed by equation r(t) _ 1 -4-7[1 --exp (--t/r(1) r(0) with a single temperature dependent time constantcorresponding to a weH-defined diffusion coefficient of defects.The disaccommodation measurements are usually performed in a temperature range where the time constant is of the order 10 3 --10 a sec and the substantial part of the isotherms can be followed experimentally in a reason-

show abstract

“…The strong increase of TC with x [2,[9][10][11] implies that the free energy difference between FE and paraelectric phases is a decreasing function of x. A close analogy exists to known aging mechanisms in ferromagnets [17] and other ferroelectrics [18], in which point-like defects diffuse to domain walls. One can estimate the magnitude of the attraction of H to the domain walls if one makes the rough guess that the domain wall environment is similar to the PE state, since the dependence of TC on x is known (dTC/dx =~107K) [2,[9][10][11], as is the latent heat of the first-order PE-FE transition [2,19,20] over a wide range of x (E.g.…”

Section: /21/19mentioning

confidence: 97%

Multiple aging mechanisms in ferroelectric deuterated potassium dihydrogen phosphate

Fields

Cieszynski

Zhao

et al. 2019

Journal of Applied Physics

View full text Add to dashboard Cite

The anomalously large dielectric aging in ferroelectric partially deuterated potassium dihydrogen phosphate (DKDP) is found to have multiple distinct mechanisms. Two components cause decreases in dielectric response over a limited range of fields around the aging field. Substantial aging occurs on time scales of ~1000s after a field change, as expected for a hydrogen/deuterium diffusion mechanism. A slower component can give almost complete loss of domain-wall dielectric response at the aging field after weeks of aging. There is also a particularly unusual aging in which the dielectric response increases with time after rapid cooling.

show abstract

Magnetic After-Effect in Iron due to Motion of Dislocations

Cited by 13 publications

References 9 publications

Aging dynamics in ferroelectric deuterated potassium dihydrogen phosphate

Aging dynamics in ferroelectric deuterated potassium dihydrogen phosphate

Measurements of the relaxation processes with a high time constant

Multiple aging mechanisms in ferroelectric deuterated potassium dihydrogen phosphate

Contact Info

Product

Resources

About