Oscillatory coupling between ferromagnetic layers separated by a nonmagnetic metal spacer

Bruno, P.; Chappert, C.

doi:10.1103/physrevlett.67.1602

Cited by 1,085 publications

(517 citation statements)

References 18 publications

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“…Theoretical treatments of the temperature dependence, taking into account some combination of these effects, predict different dependences for metallic and insulating spacer materials. [36][37][38][39] For metallic spacer lay- FIG. 10.…”

Section: B Temperature Dependence Of the Minor Loop Shiftmentioning

confidence: 99%

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕
Baruth
¹
,
Keavney
²
,
Burton
³

et al. 2006
Phys. Rev. B

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The origin of the oscillatory interlayer exchange coupling in ͓Co/ Pt͔ / NiO / ͓Co/ Pt͔ multilayers is investigated using advanced microscopy and spectroscopy techniques and micromagnetic modeling. X-ray magnetic circular dichroism ͑XMCD͒ measurements show the presence of the canting of Ni spins in the NiO film being greater for antiferromagnetically coupled multilayers than for ferromagnetically coupled ones. This behavior is consistent with the model, which assumes a different sign of the exchange coupling at the two interfaces and the antiferromagnetic layer-by-layer coupling in the NiO film. An unexpectedly short attenuation length of 4 Å for secondary electrons in NiO is measured, which has implications for the interpretation of XMCD data. Domain images obtained using XMCD-photoemission electron microscopy at the Co and Ni resonances indicate that the canting of the Ni spins occurs on both a microscopic and macroscopic scale. The average size of the domains is shown to increase with exchange coupling strength. In antiferromagnetically coupled samples, the competition between magnetostatic and interlayer exchange effects gives rise to a region of overlapping domains. The size of this region scales inversely with coupling strength. Finally, the temperature dependence of the interlayer coupling shows both reversible and irreversible effects. The irreversible effects stem from oxidation/reduction reactions at the Co/ NiO interface. The reversible effects stem from the temperature dependences of the many factors that play a role in the interlayer coupling and exhibit nonmonotonic temperature dependence.

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Section: B Temperature Dependence Of the Minor Loop Shiftmentioning

confidence: 99%

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕
Baruth
¹
,
Keavney
²
,
Burton
³

et al. 2006
Phys. Rev. B

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“…When the CuO layer thickness increases, the conductivity through the GMR layer becomes very dominant and spin-dependent scattering is not effective, so the GMR ratio is reduced. To explain the above mentioned experimental findings, we propose an indirect exchange coupling model, which was well known in a layered system containing two ferromagnetic layers and a nonmagnetic spacer relate to the oscillatory interlayer coupling [14].…”

Section: Effect Of Cuo Layer Thicknessmentioning

confidence: 99%

Development of Giant Magnetoresistance Material Based on Cobalt Ferrite

et al. 2015

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This paper describes an experimental study on development of giant magnetoresistance material based on cobalt ferrite (CoFe2O4). We have successfully developed a new giant magnetoresistance material based on CoFe2O4 i.e; sandwich (CoFe2O4/CuO/CoFe2O4), spin valve (FeMn/CoFe2O4/CuO/CoFe2O4), and organic giant magnetoresistance (CoFe2O4/Alq3/CoFe2O4) using dc-opposed target magnetron sputtering method. Crystalline structure and morphology of thin films were characterized by X-ray diffraction and scanning electron microscope. The electrical properties were characterized using a four-point probe and magnetic properties were characterized using a vibrating sample magnetometer. In sandwich structure, the giant magnetoresistance ratio maximum are found at room temperature in CoFe2O4/CuO/CoFe2O4 thin film is 70% when CoFe2O4 and CuO layer thickness are 62.5 nm and 14.4 nm, respectively. The maximum of giant magnetoresistance ratio of the spin valve structure obtained is 32.5% at FeMn layer thickness of 45 nm. Meanwhile, in organic giant magnetoresistance the maximum value of the giant magnetoresistance ratio are approximately 35.5% at room temperature.

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“…Several models [5,10,25,26] have been presented to explain the period of oscillations of the IEC. The RKKY and QW models express the period in terms of the nesting vectors at the Fermi surface.…”

Section: Comparison With Modelsmentioning

confidence: 99%

“…[5], who explained the oscillations as a function of spacer layer thickness due to the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the magnetic layers. They expressed the period of oscillations in terms of nesting vectors of the spacer's Fermi surface.…”

Section: Introductionmentioning

confidence: 99%

Energy functional dependence of exchange coupling and magnetic properties ofFe∕Nbmultilayers

Shukla

Prasad

2004

Phys. Rev. B

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We present an ab initio calculation of the exchange coupling for Fe/Nb multilayers using the self-consistent full-potential linearized augmented-plane wave (FLAPW) method. The exchange correlation potential has been treated in the local spin density approximation (LSDA) as well as generalized gradient approximation (GGA). We find that for the LSDA as well as the GGA the exchange coupling oscillates with a period of 6.0Å of Nb spacer thickness which is close to the experimental value in the preasymptotic region. This is also close to the earlier calculated period ( i.e. 4.5Å ) by augmented spherical wave (ASW) method. The LSDA shows antiferromagnetic coupling for 2 and 5 Nb monolayers (ML) but the GGA shows the ferromagnetic coupling for all Nb spacer layers. The period of oscillation is found to be in good agreement with the period calculated using the Ruderman-Kittel-Kasuya-Yosida (RKKY) and quantum well (QW) models.The magnetic moment of Fe is found to be higher in the GGA than the LSDA. Fe magnetic moment also shows strong oscillations as a function of the spacer layer thickness, in agreement with the experimental results. We find that the GGA results show better agreement with the experiment than the LSDA results.

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Oscillatory coupling between ferromagnetic layers separated by a nonmagnetic metal spacer

Cited by 1,085 publications

References 18 publications

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕
Baruth
¹
,
Keavney
²
,
Burton
³

et al. 2006
Phys. Rev. B

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕
Baruth
¹
,
Keavney
²
,
Burton
³

et al. 2006
Phys. Rev. B

Development of Giant Magnetoresistance Material Based on Cobalt Ferrite

Energy functional dependence of exchange coupling and magnetic properties ofFe∕Nbmultilayers

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Oscillatory coupling between ferromagnetic layers separated by a nonmagnetic metal spacer

Cited by 1,085 publications

References 18 publications

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕Baruth1, Keavney2, Burton3 et al. 2006Phys. Rev. B

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕Baruth1, Keavney2, Burton3 et al. 2006Phys. Rev. B

Development of Giant Magnetoresistance Material Based on Cobalt Ferrite

Energy functional dependence of exchange coupling and magnetic properties ofFe∕Nbmultilayers

Contact Info

Product

Resources

About

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕
Baruth
¹
,
Keavney
²
,
Burton
³

et al. 2006
Phys. Rev. B

Origin of the interlayer exchange coupling in[Co∕Pt]∕NiO∕[Co∕
Baruth
¹
,
Keavney
²
,
Burton
³

et al. 2006
Phys. Rev. B