Correlation of short-period oscillatory exchange coupling to nanometer-scale lateral interface structure in Fe/Cr/Fe(001)

Schmidt, C. M.; Bürgler, D. E.; Schaller, D. M.; Meisinger, F.; Güntherodt, H.‐J.

doi:10.1103/physrevb.60.4158

Cited by 50 publications

(49 citation statements)

References 36 publications

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“…At H = 0 the bulk magnetizations M 1 and M 2 are oriented antiparallel along the easy axis, because the thickness of the Cr interlayer t Cr = 10 Å yields antiferromagnetic coupling in the J 1 ͑d Cr ͒ dependence. 13 Nevertheless, the total magnetization M = M 1 + M 2 of the structure is nonzero, because the thickness of the Fe͑1͒ layer is only half of Fe͑2͒. The penetration depth of the laser light in the MOKE experiment is such that it also picks up a sizable Kerr signal from the bottom Fe͑2͒ layer.…”

Section: Resultsmentioning

confidence: 99%

“…[10][11][12] Among these the interface microstructure and magnetic properties at the interface are believed to play a major role in the appearance of the biquadratic coupling. 13 It is worth noting that up to now the static and dynamic magnetic properties of exchange coupled structures have been mainly studied by methods accessing bulk magnetic properties of the structures such as magneto-optical Kerr effect ͑MOKE͒, ferromagnetic resonance, and Brillouin light scattering. These methods allow one to determine bilinear and biquadratic coupling strengths, their variation with interlayer thickness as well as with the type and orientation of the substrate, etc.…”

Section: Introductionmentioning

confidence: 99%

“…13 The structures have been grown on GaAs͑100͒ by molecular beam epitaxy ͑MBE͒ providing a high crystalline quality of the layers and interfaces. The magnetic anisotropy in the sample plane of these structures is fourfold ͑biaxial͒ with the angle between two equivalent easy e 1 and e 2 ͑or hard h 1 and h 2 ͒ axes being 90°.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

et al. 2007

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We have studied the magnetic field dependences of magnetic optical second harmonic generation ͑SHG͒ in MBE-grown Fe/ Cr/ Fe/ Ag/ GaAs͑100͒ heterostructures displaying both bilinear and biquadratic interlayer exchange coupling. The magnetic field H was applied in the ͑100͒ surface plane along both easy ͓͑001͔͒ and hard ͓͑110͔͒ axes of the in-plane fourfold magnetic anisotropy. The SHG has been measured in reflection at near normal incidence for different polarization combinations ͑pp , ps , ss , sp͒ of the fundamental and second harmonic light in longitudinal and transversal geometries. The magnetic field variation of the SHG signal clearly reflects the field-induced transformations of the magnetic state at the interfaces in the trilayer. It strongly depends on the configuration of light polarization, experimental geometry ͑longitudinal or transversal͒, and orientation of the magnetic field H relative to the crystal axes. In contrast to linear magneto-optical Kerr effect, which is odd in magnetic field, magnetic SHG is either even in H or does not display a definite parity at all, depending on the polarization configuration. We interpret the data based on a model accounting for nonmagnetic and magnetic contributions to SHG from the surface and interfaces described by C 4v point symmetry. Taking into account the changes of the mutual orientation of interfacial magnetizations allows us to describe the general features of the measured field dependences of SHG.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

et al. 2007

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“…However, one has to be careful because this system exhibits short-period oscillations with a period of 2 monolayers ͑ML͒ which are sensitive to changes of the interface morphology. [2][3][4] Therefore, the influence of the Au layer on the growth and in particular on the roughness of the interfaces must also be characterized in order to be able to draw meaningful conclusions.…”

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confidence: 99%

In-plane momentum conservation in Fe/Cr/Au/Fe(001) layered structures

et al. 1999

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We study the effect of an Au layer at one of the Cr/Fe interfaces in epitaxial Fe/Cr/Au/Fe͑001͒ sandwich structures on the magnetic interlayer coupling behavior by magneto-optical Kerr effect measurements and on the growth by scanning tunneling microscopy. The main effect of the Au layer is the suppression of the long-period oscillations of the magnetic interlayer coupling, while the short-period oscillations become dominant although their amplitude is stronger attenuated than ϰD Ϫ2 , where D is the total thickness of the nonferromagnetic spacer layers. These findings are explained with the shapes of the Fermi surfaces of the spacer materials ͑Au and Cr͒ and in-plane momentum conservation at the Cr/Au interface of the electrons that mediate the coupling. This interpretation implicates that the N-centered ellipse of the Cr Fermi surface is the origin of the long-period oscillations across Cr spacers.

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“…7 Short-period oscillations, however, disappear if interface quality is not carefully maintained. 3,8,9 Recent experiments 10 in Fe/Cr/Fe show that areas of constant Cr thickness, with diameter larger than 3-4 nm on the interface, are necessary for the development of short-period oscillations. It is therefore believed that multiperiodicity has not yet been observed in multilayers due to interface roughness.…”

Section: Introductionmentioning

confidence: 99%

Multiperiodic magnetic structures in Hubbard superlattices

2002

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We consider fermions in one-dimensional superlattices ͑SL's͒, modeled by site-dependent Hubbard-U couplings arranged in a repeated pattern of repulsive ͑i.e., UϾ0) and free (Uϭ0) sites. Density matrix renormalization group diagonalization of finite systems is used to calculate the local moment and the magnetic structure factor in the ground state. We have found four regimes for magnetic behavior: uniform local moments forming a spin-density wave ͑SDW͒, ''floppy'' local moments with short-ranged correlations, local moments on repulsive sites forming long-period SDW's superimposed with short-ranged correlations, and local moments on repulsive sites solely with long-period SDW's; the boundaries between these regimes depend on the range of electronic densities and on the SL aspect ratio. Above a critical electronic density, ↑↓ , the SDW period oscillates both with and with the spacer thickness. The former oscillation allows one to reproduce all SDW wave vectors within a small range of electronic densities, unlike the homogeneous system. The latter oscillation is related to the exchange oscillation observed in magnetic multilayers. A crossover between regimes of ''thin'' to ''thick'' layers has also been observed.

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Correlation of short-period oscillatory exchange coupling to nanometer-scale lateral interface structure in Fe/Cr/Fe(001)

Cited by 50 publications

References 36 publications

Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

In-plane momentum conservation in Fe/Cr/Au/Fe(001) layered structures

Multiperiodic magnetic structures in Hubbard superlattices

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