Interface Fe magnetic moment enhancement in MgO/Fe/MgO trilayers

Jal, Emmanuelle; Kortright, Jeffrey B.; Chase, T.; Liu, TianMin; Gray, A. X.; Shafer, Padraic; Arenholz, Elke; Xu, Pengpeng; Jeong, Jaewoo; Samant, Mahesh G.; Parkin, Stuart S. P.; Dürr, H. A.

doi:10.1063/1.4929990

Cited by 14 publications

(12 citation statements)

References 35 publications

(52 reference statements)

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“…For the reverse setup, a single layer of MgO on Fe(001), DFT predicts a somewhat smaller but still enhanced moment in the interface Fe layer of 2.64 µ B 28 , while Ozeki et al calculated 2.75 µ B for a Fe 5 /(MgO) 5 heterostructure 29 . An enhanced moment of the Fe interface layer was also confirmed in experiment [30][31][32] , although no interfacial Fe moment enhancement was inferred from other experiments 23 . As pointed out by Feng et al 15 , electronic structure, magnetization of the interface layer and consequently also the electronic transport properties are strongly affected by the interface relaxation and sensitive to the choice of the exchange-correlation functional in the calculations.…”

Section: Introductionmentioning

confidence: 59%

Interface-related magnetic and vibrational properties in Fe/MgO heterostructures from nuclear resonant spectroscopy and first-principles calculations

Eggert

Gruner

Ollefs

et al. 2020

Phys. Rev. Materials

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We combine 57 Fe MÃűssbauer spectroscopy and 57 Fe nuclear resonant inelastic x-ray scattering (NRIXS) in nanoscale polycrystalline [bcc-57 Fe/MgO] multilayers with various Fe layer thicknesses and layer-resolved density-functional-theory (DFT) based first-principles calculations of a (001)-oriented [Fe(8 ML)/MgO(8 ML)](001) heterostructure to unravel the interface-related atomic vibrational properties of a multilayer system. In theory and experiment, we observe consistently enhanced hyperfine magnetic fields compared to bulk which is associated with the Fe/MgO interface layers. NRIXS and DFT both reveal a strong reduction of the longitudinal acoustic (LA) phonon peak in combination with an enhancement of the low-energy vibrational density of states (VDOS) suggesting that the presence of interfaces and the associated increase in the layer-resolved magnetic moments results in drastic changes in the Fe-partial VDOS. From the experimental and calculated VDOS, vibrational thermodynamic properties have been determined as a function of Fe thickness and were found to be in excellent agreement. arXiv:1911.05666v2 [cond-mat.mtrl-sci] 30 Jan 2020

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Section: Introductionmentioning

confidence: 59%

Interface-related magnetic and vibrational properties in Fe/MgO heterostructures from nuclear resonant spectroscopy and first-principles calculations

Eggert

Gruner

Ollefs

et al. 2020

Phys. Rev. Materials

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“…Among other possible sources of the discrepancies could be the value of the effective Fe moment in the proximity to the Fe/MgO interface. Some reports point towards interfacial magnetic moments at ferromagnet/oxide interfaces enhanced up to 25% 29 , 30 . Our simulations, however, show that the critical values of the surface anisotropy (i.e.…”

Section: Discussionmentioning

confidence: 99%

Symmetry broken spin reorientation transition in epitaxial MgO/Fe/MgO layers with competing anisotropies

Martínez¹,

Tiuşan²,

Hehn³

et al. 2018

Sci Rep

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The observation of perpendicular magnetic anisotropy (PMA) at MgO/Fe interfaces boosted the development of spintronic devices based on ultrathin ferromagnetic layers. Yet, magnetization reversal in the standard magnetic tunnel junctions (MTJs) with competing PMA and in-plane anisotropies remains unclear. Here we report on the field induced nonvolatile broken symmetry magnetization reorientation transition from the in-plane to the perpendicular (out of plane) state at temperatures below 50 K. The samples were 10 nm thick Fe in MgO/Fe(100)/MgO as stacking components of V/MgO/Fe/MgO/Fe/Co double barrier MTJs with an area of 20 × 20 μm2. Micromagnetic simulations with PMA and different second order anisotropies at the opposite Fe/MgO interfaces qualitatively reproduce the observed broken symmetry spin reorientation transition. Our findings open the possibilities to develop multistate epitaxial spintronics based on competing magnetic anisotropies.

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“…For the in-plane rotations, the magneticfield magnitude was kept at 70-120 Oe, far away from the soft Fe(001) and hard Fe/Co layer switching fields obtained from in-plane TMRs (see the Supplemental Material S1 and S2 [49], which also incudes Refs. [50][51][52][53][54][55]). This way, only the soft layer is rotated, and the difference in resistance can be attributed to the angle between the soft and hard layers.…”

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confidence: 99%

Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction

et al. 2020

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The interaction between superconductivity and ferromagnetism in thin film superconductor/ferromagnet heterostructures is usually reflected by a change in superconductivity of the S layer set by the magnetic state of the F layers. Here we report the converse effect: transformation of the magnetocrystalline anisotropy of a single Fe(001) layer, and thus its preferred magnetization orientation, driven by the superconductivity of an underlying V layer through a spin-orbit coupled MgO interface. We attribute this to an additional contribution to the free energy of the ferromagnet arising from the controlled generation of triplet Cooper pairs, which depends on the relative angle between the exchange field of the ferromagnet and the spin-orbit field. This is fundamentally different from the commonly observed magnetic domain modification by Meissner screening or domain wall-vortex interaction, and it offers the ability to fundamentally tune magnetic anisotropies using superconductivity-a key step in designing future cryogenic magnetic memories.

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Interface Fe magnetic moment enhancement in MgO/Fe/MgO trilayers

Cited by 14 publications

References 35 publications

Interface-related magnetic and vibrational properties in Fe/MgO heterostructures from nuclear resonant spectroscopy and first-principles calculations

Interface-related magnetic and vibrational properties in Fe/MgO heterostructures from nuclear resonant spectroscopy and first-principles calculations

Symmetry broken spin reorientation transition in epitaxial MgO/Fe/MgO layers with competing anisotropies

Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction

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