Speeding-up and scaling of domain-wall relaxation nearT c of a uniaxial ferromagnet

Grahl, M.; Kötzler, J.

doi:10.1007/bf01312532

Cited by 23 publications

(9 citation statements)

References 30 publications

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“…T c . This might be interpreted as a critical speeding up of domain walls due to the increase of the correlation length similarly as observed on the domain wall relaxation of uniaxial ferromagnets [19]. Apart from this interesting feature the change in dynamics is not at all dramatic in the vicinity of T c .…”

supporting

confidence: 59%

Dynamic Light Scattering at Domains and Nanoclusters in a Relaxor Ferroelectric

Kleemann¹,

Licínio

Woike

et al. 2001

Phys. Rev. Lett.

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supporting

confidence: 59%

Dynamic Light Scattering at Domains and Nanoclusters in a Relaxor Ferroelectric

Kleemann¹,

Licínio

Woike

et al. 2001

Phys. Rev. Lett.

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“…The behavior described by Eq. ͑4͒ has been observed in the complex susceptibility of spin glasses, 32 uniaxial ferromagnets, 33 and in Heusler ferromagnets. 12 From Eq.…”

Section: B Impedance and Magnetic Permeability Versus Frequencymentioning

confidence: 95%

Impedance and initial magnetic permeability of gadolinium

Fraga¹,

Pureur²,

Cardoso³

2010

Journal of Applied Physics

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In the present work we report on measurements of the complex impedance and the magnetoimpedance of a textured sample of gadolinium metal. The preferential c -axis orientation of the Gd hexagonal structure is perpendicular to the long axis of the sample. From the experimental data, the complex initial magnetic permeability, = Ј+ i Љ, was obtained as a function of temperature and frequency of the ac exciting current. We have found that the results for Ј͑T͒ below the spin reorientation temperature may be described as a power law of the reduced temperature t =1−T / T SR , where T SR is the spin reorientation temperature. This behavior suggests that a genuine phase transition occurs at T SR . Although the impedance displays a weak anomaly at the Curie temperature, T C , magnetic measurements indicate that the ferromagnetic response of Gd extends up to this critical point. Thus, two different phases characterizes the cooperative magnetic state of this metal. The frequency dependent results for Ј and Љ were fitted to a modified Debye formula and the obtained parameters allow us to discriminate between the contributions from domain-wall motion and from magnetization rotation. We obtain that the dynamical properties of the domain walls in Gd are governed by a broad distribution of frequencies whose average value diverge at T SR . The isothermal magnetoimpedance measurements in temperatures smaller than T SR show an interesting plateau at low dc applied fields. This plateau is limited by a characteristic field H K whose magnitude decreases rapidly to nearly zero at T SR , giving further support for the phase transition scenario at this temperature.

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“…4,12 This D 2/3 dependence was discovered on thin Co platelets at low temperature, T<£T C . X1 Because of the strong Faraday effect of LiTbF4, 18 we could observe directly the domain pattern [ Fig.…”

mentioning

confidence: 83%

“…The critical and size effects have been analyzed using a recent relaxational model; 12 however, the magnitude of the inherent local spin-flip rate remains unexplained. The data also imply a narrow relaxation spectrum consistent with the dominance of a single domain type, while the branching and nonplanar shape of the samples do not cause any significant broadening.…”

Section: Lat)-l D (Ohl-t/t C )'mentioning

confidence: 99%

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Size and fluctuation effects on the dynamics of linear domain walls in an Ising ferromagnet

Kötzler

Grahl²,

Sessler³

et al. 1990

Phys. Rev. Lett.

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Approaching the Curie temperature of LiTbF4 ellipsoids of thicknesses between 0.5 and 7 mm up to T c -r -3x 10~47V, the first clear evidence for critical fluctuations and macroscopic size effects on the domain-wall relaxation is presented. An analog to the Landau-Lifshitz model proposed recently and additional optical data on the domain width suggest associating both phenomena with the existence of linear (Bulaevskii-Ginzburg) walls and with domain branching near the surface.

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Speeding-up and scaling of domain-wall relaxation nearT c of a uniaxial ferromagnet

Cited by 23 publications

References 30 publications

Dynamic Light Scattering at Domains and Nanoclusters in a Relaxor Ferroelectric

Dynamic Light Scattering at Domains and Nanoclusters in a Relaxor Ferroelectric

Impedance and initial magnetic permeability of gadolinium

Size and fluctuation effects on the dynamics of linear domain walls in an Ising ferromagnet

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