Magnetic response of ferromagnet–superconductor bilayers

Yashwant, G.; Prajapat, C.L.; Ravikumar, G.; Soltan, S.; Christiani, G.; Habermeier, H.‐U.

doi:10.1016/j.jmmm.2011.11.055

Cited by 13 publications

(4 citation statements)

References 14 publications

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“…The XMCD signal (Mn magnetic moments) continue to decrease until the temperature drops below T SC . This decrease cannot be due to the flux expulsion by the Meissner effect in the superconducting layer 25 , but is due to the formation of smaller domains 26 which are commonly observed in YBCO/LCMO superlattices 8 .…”

Section: Resultsmentioning

confidence: 97%

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Prajapat

Singh

Bhattacharya

et al. 2018

Sci Rep

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A case study of electron tunneling or charge-transfer-driven orbital ordering in superconductor (SC)-ferromagnet (FM) interfaces has been conducted in heteroepitaxial YBa2Cu3O7(YBCO)/La0.67Sr0.33MnO3(LSMO) multilayers interleaved with and without an insulating SrTiO3(STO) layer between YBCO and LSMO. X-ray magnetic circular dichroism experiments revealed anti-parallel alignment of Mn magnetic moments and induced Cu magnetic moments in a YBCO/LSMO multilayer. As compared to an isolated LSMO layer, the YBCO/LSMO multilayer displayed a (50%) weaker Mn magnetic signal, which is related to the usual proximity effect. It was a surprise that a similar proximity effect was also observed in a YBCO/STO/LSMO multilayer, however, the Mn signal was reduced by 20%. This reduced magnetic moment of Mn was further verified by depth sensitive polarized neutron reflectivity. Electron energy loss spectroscopy experiment showed the evidence of Ti magnetic polarization at the interfaces of the YBCO/STO/LSMO multilayer. This crossover magnetization is due to a transfer of interface electrons that migrate from Ti(4+)−δ to Mn at the STO/LSMO interface and to Cu2+ at the STO/YBCO interface, with hybridization via O 2p orbitals. So charge-transfer driven orbital ordering is the mechanism responsible for the observed proximity effect and Mn-Cu anti-parallel coupling in YBCO/STO/LSMO. This work provides an effective pathway in understanding the aspect of long range proximity effect and consequent orbital degeneracy parameter in magnetic coupling.

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Section: Resultsmentioning

confidence: 97%

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Prajapat

Singh

Bhattacharya

et al. 2018

Sci Rep

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“…In order to find the phases in the system, we have to study the stationary solutions of the set of coupled mean-field dynamic equations for magnetizations, namely given in Eqs. ( 5)- (8), when the parameters T , J 1 , J 2 , J 3 , d, and h are varied. J 1 and J 2 are always taken as J 1 < 0 and J 2 < 0, i.e.…”

Section: Time Variations Of Average Magnetizationsmentioning

confidence: 99%

“…Experimentally, the structural and magnetic properties of the thin films were investigated, such as those listed below: Fe/Ni, Fe/Co, Ni/Au, Co/Cu/Ni 80 Fe 20 , La 2/3 Ca 1/3 MnO 3 /SrTiO 3 /YBa 2 Cu 3 O 7−x , FePt/Fe, and Fe/TbFe, etc. [1][2][3][4][5][6][7][8][9][10] On the theoretical side, the equilibrium and nonequilibrium magnetic properties of various systems for the case of interactions on different bilayer lattices have been studied in detail (see Refs. [11]- [37] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Dynamic magnetic behavior of the mixed spin (2, 5/2) Ising system with antiferromagnetic/antiferromagnetic interactions on a bilayer square lattice

Ertaş¹,

Keskín²

2013

Chinese Phys. B

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Using the mean-field theory and Glauber-type stochastic dynamics, we study the dynamic magnetic properties of the mixed spin (2, 5/2) Ising system for the antiferromagnetic/antiferromagnetic (AFM/AFM) interactions on the bilayer square lattice under a time varying (sinusoidal) magnetic field. The time dependence of average magnetizations and the thermal variation of the dynamic magnetizations are examined to calculate the dynamic phase diagrams. The dynamic phase diagrams are presented in the reduced temperature and magnetic field amplitude plane and the effects of interlayer coupling interaction on the critical behavior of the system are investigated. We also investigate the influence of the frequency and find that the system displays richer dynamic critical behavior for higher values of frequency than that of the lower values of it. We perform a comparison with the ferromagnetic/ferromagnetic (FM/FM) and AFM/FM interactions in order to see the effects of AFM/AFM interaction and observe that the system displays richer and more interesting dynamic critical behaviors for the AFM/AFM interaction than those for the FM/FM and AFM/FM interactions.

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“…Thus, recently there is increased interest in exploring how the on-set of superconductivity modifies the magnetic structures in FM/SC bilayers. Several techniques have been employed, including X-ray magnetic circular dichroism [19], SQUID magnetometery [20] and magneto-optical imaging techniques [21][22][23]. Here neutron reflectometry has been used to probe changes of the magnetic stripe domains in permalloy (Py) films in Py/Nb and Py/MoGe hybrids as a function of magnetic field and temperature.…”

Section: Introductionmentioning

confidence: 99%

Neutron Reflectometry Studies on Magnetic Stripe Domains in Permalloy/Superconductor bilayers

Liu¹,

Iavarone²,

Belkin³

et al. 2014

Preprint

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We explored changes in magnetic domain structures in a magnetic layer due to the onset of the superconductivity of an adjacent superconductive layer using neutron reflectometry. Magnetic domain structures in 1 µm thick permalloy (Py) films were studied as functions of magnetic field, temperature and under the influence of the onset of superconductivity in a neighboring layer. Bragg peaks in the off-specular scattering were observed at low fields following saturation with an in-plane field, which are attributed to the quasi-parallel magnetic stripes along the field direction. During the magnetization reversal from saturation, the stripe pattern shows increases in the period, the transverse coherence length (i.e., perpendicular to the stripes) and the amplitude of the out-ofplane magnetization component. The coherence length of the magnetic stripes is anisotropic in the remnant state with the longitudinal coherence length (i.e., along the stripes) being larger than the transverse one. The stripe period shows a weak temperature dependence between 300 K and 3 K, but no abrupt change in the period is observed when the temperature crosses the superconducting critical temperature.

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Magnetic response of ferromagnet–superconductor bilayers

Cited by 13 publications

References 14 publications

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Dynamic magnetic behavior of the mixed spin (2, 5/2) Ising system with antiferromagnetic/antiferromagnetic interactions on a bilayer square lattice

Neutron Reflectometry Studies on Magnetic Stripe Domains in Permalloy/Superconductor bilayers

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