Theoretical and experimental study of Fe/Cr nanometric quasiperiodic multilayers

Freire, T; Salvador, C.; Corrêa, M.A.; Bezerra, C. G.; Chesman, C.; Oliveira, Alexandre Barbosa de; Bohn, F.

doi:10.1016/j.ssc.2010.11.018

Cited by 12 publications

(3 citation statements)

References 19 publications

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“…A year later, Merlin et al 6 reported performing the first quasiperiodic superlattice following the Fibonacci sequence. More recently, first quasiperiodic Fe/Cr magnetic multilayers with biquadratic coupling were grown experimentally 7 , illustrating the development of crystal growth techniques, which allow substantial thickness control for each layer.…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetoresistance in Fibonacci multilayers

et al. 2012

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The present paper theoretically investigates magnetoresistance curves in quasiperiodic magnetic multilayers for two different growth directions, namely [110] and [100]. We considered identical ferromagnetic layers separated by non-magnetic layers with two different thicknesses chosen based on the Fibonacci sequence. Using parameters for Fe/Cr multilayers, four terms were included in our description of the magnetic energy: Zeeman, cubic anisotropy, bilinear and biquadratic couplings. The minimum energy was determined by the gradient method and the equilibrium magnetization directions found were used to calculate magnetoresistance curves. By choosing spacers with a thickness such that biquadratic coupling is stronger than bilinear coupling, unusual behaviors for the magnetoresistance were observed: (i) for the [110] case there is a different behavior for structures based on even and odd Fibonacci generations; and more interesting, (ii) for the [100] case we found magnetic field ranges for which the magnetoresistance increases with magnetic field.

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Section: Introductionmentioning

confidence: 99%

Anomalous magnetoresistance in Fibonacci multilayers

et al. 2012

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“…From an experimental perspective, advances in experimental growth techniques have enabled the synthesis of high‐quality magnetic multilayers grown in different crystallographic orientations through either sputtering or molecular beam epitaxy (MBE) . Quasiperiodic Fe/Cr multilayers presenting biquadratic and bilinear couplings have been experimentally synthesized, thereby exemplifying these technical improvements (). The magnetic properties of these materials strongly depend on the stacking pattern of the layers, which can now be arranged in an unusual fashion if necessary.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of [hkl] low‐symmetry trilayers

Celino

Costa

Bezerra

et al. 2016

Physica Status Solidi (b)

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We present a theoretical study about the influence of magneto‐crystalline anisotropies on the static and dynamic magnetic properties of trilayers coupled via bilinear and biquadratic exchange fields for situations in which the systems are grown in unusual [hkl] low‐symmetry directions. We apply a realistic phenomenological model, with a total free magnetic energy that includes Zeeman interaction and magneto‐crystalline anisotropies as well as exchange energy terms. We consider parameters from the literature to illustrate our results for Fe/Cr/Fe systems. In particular, a total of six different magnetic scenarios for the [211] and [321] low‐symmetry growth orientations and three sets of exchange fields were analyzed, and the associated magnetization, magnetoresistance, and spin‐wave frequencies were calculated. Our results show that the combination of magneto‐crystalline symmetries and exchange fields leads to various interesting properties, including different values of the saturation field for the magnetization and magnetoresistance curves. Regarding the spin‐wave modes, we observed the presence of Goldstone modes, associated with second‐order phase transitions, resulting from the competition between the Zeeman and biquadratic energies.

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“…As a consequence, layered magnetic systems have became promising for technological applications, particularly as magnetic sensors and memories of random access [8]. As a matter of fact, very recently, Fibonacci quasiperiodic Fe/Cr multilayers were grown on MgO (100) using dc magnetron sputtering [9].…”

Section: Introductionmentioning

confidence: 99%