TMOKE hysteresis loops in Bragg diffraction from 2D patterns

Geoffroy, O.; Givord, D.; Otani, Y.; Pannetier, B.; Santos, Amilton M.; Schlenker, M.; Souche, Y.

doi:10.1016/0304-8853(93)91258-9

Cited by 63 publications

(34 citation statements)

References 2 publications

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“…Previous works have demonstrated that different diffracted orders ͑termed diffracted nX to the nth spot in the incidence plane and diffracted mY to the mth spot perpendicular to the incidence plane͒ provide different loops, markedly different from the loops obtained at the reflected zeroth order. 2,3,5,9 In this work we focus the analysis in the first order ͑1X and 1Y͒ magneto-optical dependencies, but a similar analysis can be easily performed for higher orders. The hysteresis loops obtained for the direct-reflected beam and for the first diffraction orders ͑1X and 1Y͒ when changing the intertile distance are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Diffractive magneto-optics, magnetic interactions, and reversal mechanisms inComicrosquare arrays

Costa‐Krämer¹,

Alvarez‐Sánchez²,

Bengoechea³

et al. 2005

Phys. Rev. B

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The magneto-optical properties of Co microsquare-2 m edge-arrays have been investigated for different interelement separations, from 0.2 to 2.0 m. The magneto-optical response is measured both at reflected and diffracted beams, and it is compared with the results of a model that uses micromagnetic simulations and optical diffraction theory to calculate the magneto-optical response for different diffracted spots. A satisfactory agreement between the experiments and the predictions from the combined micromagnetic and optical diffraction models allows the interpretation of the experimental data and provides a way to analyze and understand the physical meaning of the magneto-optic diffracted signal. The comparison of this diffracted magneto-optical experimental data with predictions from simple reversal models allows us to monitor different element magnetization reversal mechanisms as the separation between elements in the array varies.

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Section: Resultsmentioning

confidence: 99%

Diffractive magneto-optics, magnetic interactions, and reversal mechanisms inComicrosquare arrays

Costa‐Krämer¹,

Alvarez‐Sánchez²,

Bengoechea³

et al. 2005

Phys. Rev. B

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“…Among others, basic structures of such artificial hybrids are bilayers (BLs), trilayers (TLs) and even multilayers (MLs) of homogenous films but also distinct ferromagnetic nanoparticles (FNs) placed on top of or embedded in a SC layer. 1,2,3,4,5,6 For the case of ordered arrays of FNs it has been shown that the magnetoresistance of the SC presents distinct periodic minima at specific values of the applied magnetic field.…”

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confidence: 99%

Effective ferromagnetic coupling between a superconductor and a ferromagnet inLaCaMnO∕Nbhybrids

et al. 2005

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In this work we present magnetization data on hybrids consisting of multilayers (MLs) of manganites [La0.33Ca0.67MnO3/La0.60Ca0.40MnO3]15 in contact with a low-Tc Nb superconductor (SC). Although a pure SC should behave diamagnetically in respect to the external magnetic field in our ML-SC hybrids we observed that the magnetization of the SC follows that of the ML. Our intriguing experimental results show that the SC below its T SC c becomes ferromagnetically coupled to the ML. As a result in the regime where diamagnetic behaviour of the SC was expected its bulk magnetization switches only whenever the coercive field of the ML is exceeded. By employing specific experiments where the ML was selectively biased or not we demonstrate that the ML inflicts its magnetic properties on the whole hybrid. Possible explanations are discussed in connection to recent theoretical proposals and experimental findings that were obtained in relative hybrids.PACS numbers: 74.25. Ha, 74.80.Dm In recent years hybrids comprised of superconducting (SC) and ferromagnetic (FM) ingredients have attracted much interest due to the fascinating properties that they exhibit depending on the choice of materials, their specific structure etc. Among others, basic structures of such artificial hybrids are bilayers (BLs), trilayers (TLs) and even multilayers (MLs) of homogenous films but also distinct ferromagnetic nanoparticles (FNs) placed on top of or embedded in a SC layer. 1,2,3,4,5,6 For the case of ordered arrays of FNs it has been shown that the magnetoresistance of the SC presents distinct periodic minima at specific values of the applied magnetic field.1,2,3 When the FNs are randomly distributed in the SC, periodic minima are not observed in the magnetoresistance but a clear enhancement in the surface-superconductivity critical field occurs when their saturation field is exceeded. 5,6Referring to homogenous layered hybrids recently spinvalve devices comprised of FM-SC-FM TLs are studied intensively. 7,8,9 In Refs.7,9 the studied TLs employed Nb and CuNi as the SC and FM constituents, while in Ref.8 it was studied high-T c SC YBa 2 Cu 3 O 7 in contact with FM La 0.7 Ca 0.3 MnO 3 . While in TLs comprised of low-T c Nb 7,9 the superconducting transition was increased (decreased) when the FM layers where antiparallel (parallel), in the TLs consisting of high-T c YBa 2 Cu 3 O 7 8 the opposite behaviour was observed.The present work offers experimental results on hybrids consisting of MLs of manganites in direct contact with a layer of low-T c Nb SC. We chose MLs of manganites for the constructed hybrids since we wanted to examine how the mechanism of exchange biasing 10,11 could influence the SC. In addition, the layered structure of the ML offers enhanced coercivity which is of practical importance for the design of functional apparatus. In ‡ Author to whom correspondence should be addressed (densta@ims.demokritos.gr) all samples a relatively thick FM buffer layer has been used since we expected that this should act as a main reservoir for...

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“…Diffracted MOKE magnetization loops, on the other hand, are proportional to the magnetic form factor f n m observed at the nth diffraction order of the scattered beam and can therefore yield information about the internal magnetization distribution of patterned elements in periodic arrays. [17][18][19][20][21][22][23][24] Furthermore, they can also be used to investigate and compare patterns from different arrangements of the same elements as is demonstrated in this study.…”

Section: Introductionmentioning

confidence: 96%

Magnetic structure and diffracted magneto-optics of patterned amorphous multilayers

et al. 2010

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We present magneto-optical Kerr effect measurements of patterned arrays of Co 68 Fe 24 Zr 8 / Al 2 O 3 amorphous multilayers. The multilayers were patterned in two dimensions into two different arrangements of circular and ellipsoidal islands. Magnetization loops were recorded in a longitudinal geometry using both the specularly reflected beam as well as diffracted beams scattered off the patterned films. The magnetization of the patterned structures is significantly different from the magnetization of a continuous multilayer owing to the lateral confinement of the pattern and the introduction of additional dipolar coupling between the layers at the edges of the islands. By investigating the magnetic response at the different diffraction orders from the two different configurations of islands we are able to observe the magnetization at different length scales and determine the magnetic response of the circular and ellipsoidal islands individually.

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TMOKE hysteresis loops in Bragg diffraction from 2D patterns

Cited by 63 publications

References 2 publications

Diffractive magneto-optics, magnetic interactions, and reversal mechanisms inComicrosquare arrays

Diffractive magneto-optics, magnetic interactions, and reversal mechanisms inComicrosquare arrays

Effective ferromagnetic coupling between a superconductor and a ferromagnet inLaCaMnO∕Nbhybrids

Magnetic structure and diffracted magneto-optics of patterned amorphous multilayers

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