Magnetization reversal of Gd(0001) thin films: TBIS- and MOKE butterflies in UHV

Salas, F.H.; Weller, D.

doi:10.1016/0304-8853(93)90878-6

Cited by 10 publications

(6 citation statements)

References 60 publications

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“…The sharp peak around zero field at T = 0.5 K is a part of the butterfly-shaped hysteresis loop, which is characteristic of ferromagnetism. 22) Interestingly, χ ′ (H, T ) at T = 0.2 K differs markedly from that of a regular superconductor that shows a complete shielding at low fields below H c1 . We should note two points in the ac susceptibility measurement that is quite sensitive to magnetic shielding: First, the ferromagnetism is not completely shielded and manifests itself even in zero external field deeply inside the superconducting state.…”

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confidence: 88%

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

et al. 2010

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We report ac magnetic susceptibility and dc magnetization measurements on the superconducting ferromagnet UCoGe (with superconducting and Curie temperatures of TSC ∼ 0.5 K and TCurie ∼ 2.5 K, respectively). In the normal, ferromagnetic state (TSC < T < TCurie), the magnetization curve exhibits a hysteresis loop similar to that of a regular itinerant ferromagnet. Upon lowering the temperature below TSC, the spontaneous magnetization is unchanged, but the hysteresis is markedly enhanced. Even deeply inside the superconducting state, ferromagnetism is not completely shielded, and there is no Meissner region, a magnetic field region of H < Hc1 (a lower critical field). From these results, we suggest that UCoGe is the first material in which ferromagnetism robustly survives in the superconducting state and a spontaneous vortex state without the Meissner state is realized.

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confidence: 88%

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

et al. 2010

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“…For instance, the characteristic maxima in butterfly hysteresis (Figs. 8, 9) define the coercive field 18 . Fig.…”

Section: A Time Dependence Of Ac Susceptibilitymentioning

confidence: 99%

RuthenocupratesRuSr2(Eu,Ce)2
Živković
¹
,
Hirai
²
,
Frazer
³

et al. 2002
Phys. Rev. B
61
9
35
1
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We report ac susceptibility data on RuSr2(Eu,Ce)2Cu2O10−y (Ru-1222, Ce content x=0.5 and 1.0), RuSr2GdCu2O8 (Ru-1212) and SrRuO3. Both Ru-1222 (x=0.5, 1.0) sample types exhibit unexpected magnetic dynamics in low magnetic fields: logarithmic time relaxation, switching behavior, and 'inverted' hysteresis loops. Neither Ru-1212 nor SrRuO3 exhibit such magnetic dynamics. The results are interpreted as evidence of the complex magnetic order in Ru-1222. We propose a specific multilayer model to explain the data, and note that superconductivity in the ruthenocuprate is compatible with both the presence and absence of the magnetic dynamics.

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“…Another type of hysteretic behavior of a ferromagnet can be studied in the mutual inductance arrangement of ac susceptibility technique, imposing an ac field superimposed over the sweeping and cycling dc field. In the latter case one measures a butterfly hysteresis [14]. In increasing dc field it is characterized by a monotonously decreasing virgin curve, followed by the repetitive branches of further reduced susceptibility values.…”

Section: Resultsmentioning

confidence: 98%

Two component butterfly hysteresis in RuSr2EuCeCu2O10 ruthenocuprate

Živković

Drobac

Prester

2006

Physica C: Superconductivity

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We report detailed studies of the ac susceptibility butterfly hysteresis on the Ru1222 ruthenocuprate compounds. Two separate contributions to these hysteresis have been identified and studied. One contribution is ferromagnetic-like and is characterized by the coercive field maximum. Another contribution, represented by the so called inverted maximum, is related to the unusual inverted loops, unique feature of Ru1222 butterfly hysteresis. The different nature of the two identified magnetic contributions is proved by the different temperature dependences involved. By lowering the temperature the inverted peak gradually disappears while the coercive field slowly raises. If the maximum dc field for the hysteresis is increased, the size of the inverted part of the butterfly hysteresis monotonously grows while the position of the peak saturates. In reaching saturation exponential field dependence has been demonstrated to take place. At T = 78 K the saturation field is 42 Oe.

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Magnetization reversal of Gd(0001) thin films: TBIS- and MOKE butterflies in UHV

Cited by 10 publications

References 60 publications

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

RuthenocupratesRuSr2(Eu,Ce)2
Živković
¹
,
Hirai
²
,
Frazer
³

et al. 2002
Phys. Rev. B
61
9
35
1
View full text Add to dashboard Cite

Two component butterfly hysteresis in RuSr2EuCeCu2O10 ruthenocuprate

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Magnetization reversal of Gd(0001) thin films: TBIS- and MOKE butterflies in UHV

Cited by 10 publications

References 60 publications

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State

RuthenocupratesRuSr2(Eu,Ce)2Živković1, Hirai2, Frazer3 et al. 2002Phys. Rev. B619351View full textAdd to dashboardCite

Two component butterfly hysteresis in RuSr2EuCeCu2O10 ruthenocuprate

Contact Info

Product

Resources

About

RuthenocupratesRuSr2(Eu,Ce)2
Živković
¹
,
Hirai
²
,
Frazer
³

et al. 2002
Phys. Rev. B
61
9
35
1
View full text Add to dashboard Cite