Energy functional dependence of exchange coupling and magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Nb</mml:mi></mml:mrow></mml:math>multilayers

Shukla, Nitya Nath; Prasad, R.

doi:10.1103/physrevb.70.014420

Cited by 10 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To calculate the total energies, the Brillouin zone summation was performed with a 32 × 32 × 1 k-point grid, the plane-wave energy cutoff was 400 eV, and the convergence criteria was less than 10 −3 meV. The sufficiently large number of k points and high accuracy of total energy calculation were needed to ensure that the estimated error in IEC was less than 10 −1 meV 42 43 .…”

Section: Methodsmentioning

confidence: 99%

Engineering the interlayer exchange coupling in magnetic trilayers

Chang

Dou

Chen

et al. 2015

Sci Rep

View full text Add to dashboard Cite

When the thickness of metal film approaches the nanoscale, itinerant carriers resonate between its boundaries and form quantum well states (QWSs), which are crucial to account for the film’s electrical, transport and magnetic properties. Besides the classic origin of particle-in-a-box, the QWSs are also susceptible to the crystal structures that affect the quantum resonance. Here we investigate the QWSs and the magnetic interlayer exchange coupling (IEC) in the Fe/Ag/Fe (001) trilayer from first-principles calculations. We find that the carriers at the Brillouin-zone center (belly) and edge (neck) separately form electron- and hole-like QWSs that give rise to an oscillatory feature for the IEC as a function of the Ag-layer thickness with long and short periods. Since the QWS formation sensitively depends on boundary conditions, one can switch between these two IEC periods by changing the Fe-layer thickness. These features, which also occur in the magnetic trilayers with other noble-metal spacers, open a new degree of freedom to engineer the IEC in magnetoresistance devices.

show abstract

Section: Methodsmentioning

confidence: 99%

Engineering the interlayer exchange coupling in magnetic trilayers

Chang

Dou

Chen

et al. 2015

Sci Rep

View full text Add to dashboard Cite

show abstract

“…43 The observation of a reduced Fe moment in pseudomorphic Fe/Pt͑111͒ also correlates with the observation that in pseudomorphic Co films grown on W͑110͒ the tendency toward ferromagnetic ordering is strongly reduced while it is preserved in reconstructed films with partial misfit dislocations. 86 XMCD spectra have also been measured at the M 2,3 edges of Rh. They allow to conclude that the magnetic moments induced in the substrate are ferromagnetically aligned with those in the magnetic adlayer but a quantitative determination of the induced magnetization was impossible.…”

Section: Discussionmentioning

confidence: 99%

Magnetic anisotropy of Fe and Co ultrathin films deposited on Rh(111) and Pt(111) substrates: An experimental and first-principles investigation

et al. 2010

View full text Add to dashboard Cite

We report on a combined experimental and theoretical investigation of the magnetic anisotropy of Fe and Co ultrathin layers on strongly polarizable metal substrates. Monolayer ͑ML͒ films of Co and Fe on Rh͑111͒ have been investigated in situ by x-ray magnetic circular dichroism ͑XMCD͒, magneto-optic Kerr effect, and scanning tunneling microscopy. The experiments show that both magnetic adlayers exhibit ferromagnetic order and enhanced spin and orbital moments compared to the bulk metals. The easy magnetization axis of 1 ML Co was found to be in plane, in contrast to Co/Pt͑111͒, and that of 1 ML Fe out of plane. The magnetic anisotropy energy ͑MAE͒ derived from the magnetization curves of the Fe and Co films is one order of magnitude larger than the respective bulk values. XMCD spectra measured at the Rh M 2,3 edges evidence significant magnetic polarization of the Rh͑111͒ surface with the induced magnetization closely following that of the overlayer during the reversal process. The easy axis of 1-3 ML Co/Rh͑111͒ shows an oscillatory in-plane/out-of-plane behavior due to the competition between dipolar and crystalline MAE. We present a comprehensive theoretical treatment of the magnetic anisotropy of Fe and Co layers on Rh͑111͒ and Pt͑111͒ substrates. For free-standing hexagonally close-packed monolayers the MAE is in plane for Co and out of plane for Fe. The interaction with the substrate inverts the sign of the electronic contribution to the MAE, except for Fe/Rh͑111͒, where the MAE is only strongly reduced. For Co/Rh͑111͒, the dipolar contribution outweighs the band contribution, resulting in an in-plane MAE in agreement with experiment while for Co/Pt͑111͒ the larger band contribution dominates, resulting in an out-of-plane MAE. For Fe films however, the calculations predict for both substrates an in-plane anisotropy in contradiction to the experiment. At least for Fe/Pt͑111͒ comparison of theory and experiment suggests that the magnetic structure of the adlayer is more complex than the homogenous ferromagnetic order assumed in the calculations. The angular momentum and layer-resolved contributions of the overlayer and substrate to the MAE and orbital moment anisotropy are discussed with respect to the anisotropic hybridization of the 3d, 4d, and 5d electron states and vertical relaxation. The role of technically relevant parameters such as the thickness of the surface slab, density of k points in the Brillouin zone, and electron-density functionals is carefully analyzed.

show abstract

“…It was found that antiferromagnetic (AF) coupling oscillates with period of about 0.8-1 nm. However, the first AF peak was observed near 6 monolayers of Nb(110) spacer instead of expected by ab-initio calculations 2 monolayers [9]. The above behaviour was explained by a relatively big difference in the lattice parameter of Fe and Nb (13%).…”

Section: Introductionmentioning

confidence: 70%

Modification of Exchange Coupling in Fe/Nb/Fe/Pd Layered Structures using Hydrogen

et al. 2018

View full text Add to dashboard Cite

Fe/Nb/Fe trilayers were prepared at room temperature using UHV magnetron sputtering. The interlayer exchange coupling energy was determined from a shift of the minor hysteresis loop from the origin. Results showed clear antiferromagnetic (AF) coupling maxima near 6 and 9 monolayers of Nb spacer. Calculations of the interlayer exchange coupling energy were carried out using ab-initio method with localized spin density approximations of exchange-correlation potential. The experimental results were in good agreement with ab-initio calculations. Furthermore, the position of the AF peaks and coupling energy values could be modified using hydrogen.

show abstract

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

Cited by 10 publications

References 29 publications

Engineering the interlayer exchange coupling in magnetic trilayers

Engineering the interlayer exchange coupling in magnetic trilayers

Magnetic anisotropy of Fe and Co ultrathin films deposited on Rh(111) and Pt(111) substrates: An experimental and first-principles investigation

Modification of Exchange Coupling in Fe/Nb/Fe/Pd Layered Structures using Hydrogen

Contact Info

Product

Resources

About