Realizing a high magnetic moment in Gd/Cr/FeCo: The role of the rare earth

Ward, C.; Scheunert, Gunther; Hendren, William; Hardeman, R. W.; Gubbins, M.; Bowman, R. M.

doi:10.1063/1.4794820

Cited by 30 publications

(24 citation statements)

References 25 publications

(35 reference statements)

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“…The effect of the Cr layer thickness on interlayer coupling was also studied in the FeCo/Cr/Gd [20] and Co/Cr/Gd [21] superlattices, which are similar to the Fe/Cr/Gd system. However, the existence of only magnetometric data in those works makes it difficult to draw unambiguous conclusions regarding the charac ter of interlayer exchange.…”

Section: Interlayer Coupling In Fe/cr/gd Multilayer Structuresmentioning

confidence: 99%

Interlayer coupling in Fe/Cr/Gd multilayer structures

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Savitsky

et al. 2015

J. Exp. Theor. Phys.

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The effect of the chromium layer thickness on the magnetic state of an [Fe/Cr/Gd/Cr] n multilayer structure is studied. A series of Fe/Cr/Gd structures with Cr spacer thicknesses of 4-30 Å is studied by SQUID magnetometry and ferromagnetic resonance in the temperature range 4.2-300 K. The obtained experimental results are described in terms of an effective field model, which takes into account a biquadratic contribution to the interlayer coupling energy and a nonuniform magnetization distribution inside the gado linium layer (which was detected earlier). Depending on the magnetic field and temperature, the following types of magnetic ordering are identified at various chromium layer thicknesses: ferromagnetic, antiferro magnetic, and canted ordering. A comparison of the experimental and calculated curves allowed us to deter mine the dependence of the bilinear (J 1 ) and biquadratic (J 2 ) exchange constants on chromium layer thick ness t Cr . Weak oscillations at a period of about 18 Å are detected in the J 1 (t Cr ) dependence in the range 8-30 Å. The interlayer coupling oscillations in the system under study are assumed to be related to the RKKY exchange interaction mechanism via the conduction electrons of Cr.

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Section: Interlayer Coupling In Fe/cr/gd Multilayer Structuresmentioning

confidence: 99%

Interlayer coupling in Fe/Cr/Gd multilayer structures

Дровосеков

Крейнес

Savitsky

et al. 2015

J. Exp. Theor. Phys.

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“…1,2 This renewal of interest is due to a number of reasons that range from basic physics issues related to the magnetism in the 4f metal and also its application potentials that can utilize the large moment of Gd in multilayer devices and its rather unique property that it is an elemental ferromagnet that can show substantial magnetocaloric effect. 3,4 The recent investigations, in contrast to the past and classic investigation in single crystals, 5,6 are done in films 7 and nano-structured materials made by melt quenching. 1,2,8 Investigation of Gd in nano-structured form is different because the spins in 4f are strongly localized, which are indirectly coupled via the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction.…”

Section: Introductionmentioning

confidence: 99%

Low field magnetoresistance of gadolinium nanowire

Chakravorty

Raychaudhuri

2014

Journal of Applied Physics

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Magnetization reversal and magnetoresistance behavior of perpendicularly magnetized [Co/Pd]4/Au/[Co/Pd]2 nanowiresWe report low field (l 0 H < 0.2 T) magnetoresistance (MR) studies on a single Gd nanowire patterned from a nano-structured film (average grain size $ 35 nm) by focused ion beam. For comparison, we did similar MR measurements on a polycrystalline sample with large crystallographic grains ($4 lm). It is observed that in the low field region where the MR is due to motion of magnetic domains, the MR in the large grained sample shows a close relation to the characteristic temperature dependent magnetocrystalline anisotropy including a sharp rise in MR at the spin reorientation transition at 235 K. In stark contrast, in the nanowire, the MR shows complete suppression of the above behaviours and it shows predominance of the grain boundary and spin disorder controlling the domain response. V C 2014 AIP Publishing LLC. [http://dx.

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“…Ultrathin RE magnetic films and multilayers have also attracted attention due to their ability to induce perpendicular magnetic anisotropy in adjacent transition-metal layers [11], control magnetic damping in spin valve devices [12,13], as well as fabricate materials with higher magnetization compared to transition-metal alloys [14,15].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetism of Tm atoms and monolayers on W(110)

et al. 2014

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We investigated the growth and magnetic properties of Tm atoms and monolayers deposited on a W(110) surface using scanning tunneling microscopy and x-ray magnetic circular and linear dichroism. The equilibrium structure of Tm monolayer films is found to be a strongly distorted hexagonal lattice with a Moiré pattern due to the overlap with the rectangular W(110) substrate. Monolayer as well as isolated Tm adatoms on W present a trivalent ground-state electronic configuration, contrary to divalent gas phase Tm and weakly coordinated atoms in quench-condensed Tm films. Ligand field multiplet simulations of the x-ray absorption spectra further show that Tm has a |J = 6,J z = ±5 electronic ground state separated by a few meV from the next lowest substates |J = 6,J z = ±4 and |J = 6,J z = ±6 . Accordingly, both the Tm atoms and monolayer films exhibit large spin and orbital moments with out-of-plane uniaxial magnetic anisotropy. X-ray magnetic dichroism measurements as a function of temperature show that the Tm monolayers develop antiferromagnetic correlations at about 50 K. The triangular structure of the Tm lattice suggests the presence of significant magnetic frustration in this system, which may lead to either a noncollinear staggered spin structure or intrinsic disorder.

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Realizing a high magnetic moment in Gd/Cr/FeCo: The role of the rare earth

Cited by 30 publications

References 25 publications

Interlayer coupling in Fe/Cr/Gd multilayer structures

Interlayer coupling in Fe/Cr/Gd multilayer structures

Low field magnetoresistance of gadolinium nanowire

Structure and magnetism of Tm atoms and monolayers on W(110)

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