Effects of finite anisotropy parameter Q in the determination of magnetic bubble material parameters

Blake, T.G.W.; Shir, C. C.; Tu, Yih-O; Torre, E. Della

doi:10.1109/tmag.1982.1061964

Cited by 10 publications

(18 citation statements)

References 9 publications

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“…Around and below the critical thickness the predicted periods are now lower than the measured values (in contrast to lines representing the KE theory in Fig. 6 and the calculations [16] in Fig. 7).…”

Section: Comparison With Theorymentioning

confidence: 58%

“…We have therefore extended the micromagnetic computation over a larger film thickness range, using fine square-net divisions for the entire film cross section (due to peri-3, We have verified that these formulas indeed interpolate the original numerical results of Blake et al [16] (their Fig. 3), but the transformed results presented in another graph and a table are not consistent with them.…”

Section: Comparison With Theorymentioning

confidence: 79%

“…We may now compare them with rather exact measurements. For the simply undulated structure Szymczak [8,91 derived the dependences (16) = @0.210.4h0.6…”

Section: Comparison With Theorymentioning

confidence: 99%

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Experimental Verification of Theoretical Relations for the Domain Structure of Uniaxial Ferromagnets

Gemperle

Murtinová

Kamberský

1996

Phys. Stat. Sol. (a)

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Precise measurements of stripe domain periods and of bubble domain collapse field in two garnets over a wide thickness range are reported along with a comparison with existing theories and attempts to determine from them the material parameters. Domain periods obey the Kittel half-power law in an intermediate sample thickness range, increase more steeply at larger sample thickness in accordance with the Szymczak theory, and also increase with decreasing sample thickness (below a 'critical' value) as earlier predicted by MAlek and Kamberskjr. The correction to the Kittel law derived by Kooy and Em, which affects the determination of the characteristic material length and the wall energy, is supported by the presented results of micromagnetic calculations. contrary to earlier micromagnetic results by Blake et al. The bubble collapse fields fit well the Thiele theory with micromagnetic corrections reported by Blake et al. Genaue Messungen der Streifendomanenperioden und der Kollapsfelder von Zylinderdomanen in zwei Granatproben in einem weiten Schichtdickenbereich werden vorgelegt, zusammen mit einem Vergleich mit existierenden Theorien und einem Versuch, aus ihnen die Materialparameter zu bestimmen. Die Domiinenperioden folgen dem Kittelschen Wurzelgesetz im mittleren Schichtdickenbereich, nehmen bei grof5eren Schichtdicken entsprechend der Theorie von Szymczak steiler zu, und nehmen auch bei abnehmenden Schichtdicken (unter einer ,kritischen' Dicke) zu, wie von PIiIBlek und Kamberskjr vorhergesagt. Die von Kooy und Enz abgeleitete Korrektur des Kittelschen Gesetzes, die die Bestimmung der charakteristischen Materiallange und der Wandenergie beeinfluBt, wird durch die Ergebnisse mikromagnetischer Rechnungen unterstiitzt, im Gegensatz zu friiheren Ergebnissen von Blake et al. Die Kollapsfelder der Zylinderbereiche stimmen mit der Thiele-Theorie mit den mikromagnetischen Korrekturen von Blake et al. gut uberein.

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Section: Comparison With Theorymentioning

confidence: 58%

Section: Comparison With Theorymentioning

confidence: 79%

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Experimental Verification of Theoretical Relations for the Domain Structure of Uniaxial Ferromagnets

Gemperle

Murtinová

Kamberský

1996

Phys. Stat. Sol. (a)

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“…The equilibrium domain width in magnetic films with perpendicular anisotropy and large quality factors Q= K/2πM 2 s (K is the uniaxial anisotropy constant) is well described by experimentally proven formulas [37][38][39] [37][38]:…”

Section: Garnet Film With Wide Domainsmentioning

confidence: 99%

Domain structure and magnetic pinning in ferromagnetic/superconducting hybrids

et al. 2012

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Magnetic patterns in three iron-garnet films with different magnetic properties covered with 100 nm superconducting Nb film are studied using magneto-optical imaging technique. In all samples the strong coupling between ferromagnetic domains and vortices noticeably modifies the magnetization process. However, depending on the type and width of the magnetic domains we observe different flux dynamics in the Nb film. Wide domains give rise to a combined domain structure and type-I like superconducting response resulting in enhanced attenuation of the flux motion due to cooperative pinning of vortices and magnetic domain walls. These combined domains strongly shrink in the ac fields due to a dynamic instability triggered by oscillating domain walls. Combined domains formed on narrow magnetic domains do not shrink but they guide the motion of vortices and in turn align in the vortex motion direction. This introduces superconducting current anisotropy due to strong pinning on the magnetic domain walls. Irregular magnetic domain structures with immobilized domain walls stochastically modify the vortex entry patterns. The presence of magnetic domains essentially arrests thermomagnetic avalanches in the superconducting layer. The studied magnetic pinning has a good potential for slowing down vortices in high-T c superconductors.

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“…3(a)-(g). determining parameters such as wall energy and saturation magnetization without the need for magnetometer measurements [16]. Fig.…”

Section: Bismuth Substituted Iron Garnet Epilayersmentioning

confidence: 99%

Room temperature magnetic imaging of magnetic storage media and garnet epilayers in the presence of external magnetic fields using a sub-micron GaAs SHPM

Sandhu

Masuda

Oral

et al. 2001

Journal of Crystal Growth

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A multipurpose room temperature scanning Hall probe microscope (RT-SHPM) system incorporating an ultra-high sensitive sub-micron GaAs Hall probe (active area of $0.8 Â 0.8 mm 2 ; room temperature Hall coefficient of 0.3 O/G) exhibiting extremely high magnetic field sensitivity (0.04G/ p Hz) was used for the direct, non-invasive and quantitative imaging of magnetic field fluctuations in very close proximity to the surfaces of thin film magnetic storage media, Bi substituted iron garnet epilayers and demagnetized Sr-ferrite permanent magnets placed in external magnetic fields. A scanning tunnelling microscope tip integrated adjacent to the Hall probe was used for precise vertical positioning of the probe. RT-SHPM images of 1.4 MB written floppy disks clearly showed well-defined magnetic transitions to coalesce into small island-like structures under external perpendicular fields greater than 1300 Oe. The RT-SHPM is demonstrated to be a versatile means of quantitatively monitoring micron-sized magnetic domain structures in the presence of external magnetic fields at room temperature. #

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Effects of finite anisotropy parameter Q in the determination of magnetic bubble material parameters

Cited by 10 publications

References 9 publications

Experimental Verification of Theoretical Relations for the Domain Structure of Uniaxial Ferromagnets

Experimental Verification of Theoretical Relations for the Domain Structure of Uniaxial Ferromagnets

Domain structure and magnetic pinning in ferromagnetic/superconducting hybrids

Room temperature magnetic imaging of magnetic storage media and garnet epilayers in the presence of external magnetic fields using a sub-micron GaAs SHPM

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