Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film

Marcham, M. K.; Yu, Wei; Keatley, P. S.; Shelford, L. R.; Shafer, Padraic; Cavill, S. A.; Qing, H.; Neudert, Andreas; Childress, J. R.; Katine, J. A.; Arenholz, Elke; Telling, Neil D.; Laan, G. van der; Hicken, R. J.

doi:10.1063/1.4792740

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…4). In contrast, a divalent 4f 13 ground state would give only one absorption line at the M 5 edge and none at the M 4 edge [47,48,68,69]. This result is somewhat surprising as in the gas phase nearly all RE atoms, with the exception of La and Gd, are known to exist in a divalent ground state.…”

Section: Electronic Ground Statementioning

confidence: 39%

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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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Section: Electronic Ground Statementioning

confidence: 39%

“…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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“…However, these methods are limited in that they can only detect the net response of the whole multilayer sample. Recently, x-ray detected FMR (XFMR) has emerged as a powerful synchrotron radiation based tool that can be used to study the element-(and thus layer-) specific magnetization dynamics [10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Magnetic and chemical contrast in XFMR is obtained by x-ray magnetic circular dichroism (XMCD) [24,25].…”

Section: Introductionmentioning

confidence: 99%

Spin pumping through a topological insulator probed by x-ray detected ferromagnetic resonance

Figueroa

Baker

Collins-McIntyre

et al. 2016

Journal of Magnetism and Magnetic Materials

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“…In practice, the response of individual layers can only be inferred indirectly by comparing the experimental FMR spectra with micromagnetic modelling [14]. Recently, x-ray detected FMR (XFMR) has emerged as a powerful synchrotron radiation based tool that can be used to study the element-selective magnetization dynamics [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Magnetic and chemical contrast in XFMR is obtained by x-ray magnetic circular dichroism (XMCD) [33,34], while phase differences in the magnetization precessions can be monitored using a stroboscopic measurement technique.…”

Section: Introductionmentioning

confidence: 99%

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

et al. 2015

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Exchange-coupled hard and soft magnetic layers find extensive use in data storage applications, for which their dynamical response has great importance. With bulk techniques, such as ferromagnetic resonance (FMR), it is difficult to access the behaviour and precise influence of each individual layer. By contrast, the synchrotron radiation-based technique of x-ray detected ferromagnetic resonance (XFMR) allows element-specific and phase-resolved FMR measurements in the frequency range 0.5-11 GHz. Here, we report the study of the magnetization dynamics of an exchange-coupled Ni 0.81 Fe 0.19 (43.5 nm)/Co 0.5 Fe 0.5 (30 nm) bilayer system using magnetometry and vector network analyser FMR, combined with XFMR at the Ni and Co L 2 x-ray absorption edges. The epitaxially grown bilayer exhibits two principal resonances denoted as the acoustic and optical modes. FMR experiments show that the Kittel curves of the two layers cannot be taken in isolation, but that their modelling needs to account for an interlayer exchange coupling. The angular dependence of FMR indicates a collective effect for the modes of the magnetically hard CoFe and soft NiFe layer. The XFMR precessional scans show that the acoustic mode is dominated by the Ni signal with the Co and Ni magnetization precessing in phase, whereas the optical mode is dominated by the Co signal with the Co and Ni magnetization precessing in anti-phase. The response of the Co signal at the Ni resonance, and vice versa, show induced changes in both amplitude and phase, which can be ascribed to the interface exchange coupling. An interesting aspect of phase-resolved XFMR is the ability to distinguish between static and dynamic exchange coupling. The element-specific precessional scans of the NiFe/CoFe bilayer clearly have the signature of static exchange coupling, in which the effective field in one layer is aligned along the magnetization direction of the other layer.

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Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film

Cited by 11 publications

References 13 publications

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

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

Spin pumping through a topological insulator probed by x-ray detected ferromagnetic resonance

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

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