Domain Observations on FeCrFe Layered Structnres. Evidence for a Biquadratic Coupling Effect

Rührig, M.; Schäfer, Rudolf; Hubert, A.; Mosler, R.; Wolf, J. A.; Demokritov, S. O.; Grünberg, P.

doi:10.1002/pssa.2211250225

Cited by 417 publications

(171 citation statements)

References 14 publications

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“…The interlayer exchange coupling between the magnetizations M 1 and M 2 of two ferromagnetic layers separated by a non-magnetic spacer layer is parameterized by the bilinear (J 1 ) and biquadratic (J 2 ) coupling parameters defined via the phenomenological energy density expression [11]:…”

Section: Resultsmentioning

confidence: 99%

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Belmeguenai¹,

Martin²,

Woltersdorf³

et al. 2008

J. Phys.: Condens. Matter

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Vector network analyzer ferromagnetic resonance spectroscopy (VNA-FMR) is used here to study the different excited modes of sputtered asymmetrical NiFe(13.6 nm)/Ru(d Ru )/ NiFe(27.2 nm) exchange-coupled films with variable Ru thicknesses. The obtained results have been compared to those of the symmetrical NiFe(30 nm)/Ru(d Ru )/NiFe(30 nm). In both cases, the measurements show the existence of an optic and an acoustic precessional mode. The optic mode was only observed over limited field ranges, especially in the symmetrical trilayers. To overcome such a limitation, we developed a new technique similar to the longitudinal FMR, where the bias and the rf field are parallel to each other and perpendicular to the pinning field. Interestingly, and in contrast to the symmetrical trilayers, we observed a mode anti-crossing in the dispersion relation of the asymmetrical layers that we attributed to the thickness difference between the two NiFe layers. Our experimental results on the effect of the biquadratic coupling on the mode frequency variations are in good agreement with the theory.

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Section: Resultsmentioning

confidence: 99%

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Belmeguenai¹,

Martin²,

Woltersdorf³

et al. 2008

J. Phys.: Condens. Matter

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“…The next simplest method is to add the higher-order terms of the IEC to the bilinear J 1 ; the biquadratic term J 2 is commonly utilized (simple-J 1 &J 2 model) [22,23].…”

Section: A Modelmentioning

confidence: 99%

Antiferromagnetic coupling and impurity effects at junctions betweenFe3O4and Fe(001) layers

et al. 2015

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We investigated the strong antiferromagnetic (AF) interlayer exchange coupling (IEC) at junctions between Fe(001) and Fe 3 O 4 (001) epitaxial films and the effects of an insertion layer of Mn or Co. In addition, we developed a nonlinear least-squares-fit technique to analyze the details of the magnetization processes and to distill the IEC constants. The analyses were performed by taking into account bilinear and biquadratic exchange couplings with a twisted magnetization state. The fitting results suggest the existence of significant distributions in bilinear and/or biquadratic IECs, which can originate from nonuniform stacking of atoms at the interface. The insertion of a Co layer with a thickness in the range of zero to two monolayers between the Fe 3 O 4 (001) and the Fe(001) layers significantly affects the magnetic-hysteresis (M-H) processes, whereas the insertion of a Mn layer does not. A quantitative fitting analysis of M-H curves suggests that the inserted thin Mn layer does not affect the AF-IEC significantly, whereas the Co layer suppresses the AF coupling and in fact is preferable for achieving ferromagnetic coupling, which is consistent with the tendency predicted by our theoretical model regarding impurity effects for the IEC of Fe/Fe 3 O 4 (001).

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“…alignment (90°) between the magnetizations of ferromagnetic layers in Fe/Cr/Fe (100) structures were reported [7]. This behavior could not be explained only by the usual bilinear exchange coupling in free magnetic energy.…”

mentioning

confidence: 92%

Theoretical and experimental study of Fe/Cr nanometric quasiperiodic multilayers

Freire¹,

Salvador²,

Corrêa³

et al. 2011

Solid State Communications

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a b s t r a c tAn experimental and theoretical study of magnetization curves of Fe/Cr nanometric magnetic films grown with the structure of the quasiperiodic Fibonacci sequence is presented. Fe ferromagnetic films with interfilm exchange coupling provided by intervening Cr non-ferromagnetic layers were grown on MgO (100) by dc magnetron sputtering at 300• C. The magnetization curves were investigated using the magneto-optical Kerr effect with the external field applied along the easy axis. The theoretical approach for this system is based on a realistic phenomenological model that includes the following contributions to free magnetic energy: Zeeman, cubic magneto-crystalline anisotropy, as well as bilinear and biquadratic exchange energies. Our numerical results are in very good agreement with the experimental data.

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Domain Observations on FeCrFe Layered Structnres. Evidence for a Biquadratic Coupling Effect

Cited by 417 publications

References 14 publications

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Microwave spectroscopy with vector network analyzer for interlayer exchange-coupled symmetrical and asymmetrical NiFe/Ru/NiFe

Antiferromagnetic coupling and impurity effects at junctions betweenFe3O4and Fe(001) layers

Theoretical and experimental study of Fe/Cr nanometric quasiperiodic multilayers

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