Microscopic origin of the reduced magnetocrystalline anisotropy with increasing oxide content in Co<sub>80</sub>Pt<sub>20</sub> : oxide thin films

Zhang, Wen; Morton, Simon A.; Wong, Ping Kwan Johnny; Lü, Bin; Xu, Yongbing; Jong, M. P. de; Wiel, Wilfred G. van der; Laan, G. van der

doi:10.1088/0022-3727/46/40/405001

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…The MAE is obtained from the difference between the XMCD hysteresis loops measured at different geometries, using , where H is the applied magnetic field, and M NI and M GI represent the normalized XMCD signal in the NI and GI loops, respectively. 39,40 Clearly, the MAE follows a consistent trend with the behavior of Δ(m L /m S ), which is qualitatively in agreement with the perturbationtheory model proposed by Bruno, where MAE is given by a term proportional to Δm L . 41 This suggests that the orbital moment, although small, has the ability to redirect the spin moment into a perpendicular direction due to the spin−orbit coupling.…”

Section: Resultssupporting

confidence: 88%

Ferromagnet/Two-Dimensional Semiconducting Transition-Metal Dichalcogenide Interface with Perpendicular Magnetic Anisotropy

et al. 2019

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Ferromagnet/two-dimensional transition-metal dichalcogenide (FM/2D TMD) interfaces provide attractive opportunities to push magnetic information storage to the atomically thin limit. Existing work has focused on FMs contacted with mechanically exfoliated or chemically vapordeposition-grown TMDs, where clean interfaces cannot be guaranteed. Here, we report a reliable way to achieve contamination-free interfaces between ferromagnetic CoFeB and molecular-beam epitaxial MoSe 2 . We show a spin reorientation arising from the interface, leading to a perpendicular magnetic anisotropy (PMA), and reveal the CoFeB/2D MoSe 2 interface allowing for the PMA development in a broader CoFeB thickness-range than common systems such as CoFeB/MgO. Using X-ray magnetic circular dichroism analysis, we attribute generation of this PMA to interfacial d−d hybridization and deduce a general rule to enhance its magnitude. We also demonstrate favorable magnetic softness and considerable magnetic moment preserved at the interface and theoretically predict the interfacial band matching for spin filtering. Our work highlights the CoFeB/2D MoSe 2 interface as a promising platform for examination of TMD-based spintronic applications and might stimulate further development with other combinations of FM/2D TMD interfaces.

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Section: Resultssupporting

confidence: 88%

Ferromagnet/Two-Dimensional Semiconducting Transition-Metal Dichalcogenide Interface with Perpendicular Magnetic Anisotropy

et al. 2019

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“…To find out the mechanism behind the improved Gilbert damping and in turn a rule for obtaining controllable damping in different layers, we performed element-specific XMCD, which is an ideal tool to study the influence of the spin–orbit coupling because of its unique capability to separate the orbital and spin moments. , Figure a–c shows the normalized XMCD spectra for the TM (Co, Ni, and Fe) L 2,3 edges, taken in the remnant state of the samples after magnetic saturation, from which the orbital ( m L ) and spin ( m S ) moments of the TMs can be evaluated using the sum rules analysis. , The spectra at the RE (Gd and Tb) M 4,5 edges in stack B are also examined, and shown in Figure d, e, exhibiting an antiferromagnetic coupling to the TMs, as was already demonstrated by the XMCD loops in Figure c, d.…”

Section: Resultsmentioning

confidence: 99%

Selective Tuning of Gilbert Damping in Spin-Valve Trilayer by Insertion of Rare-Earth Nanolayers

Zhang

Wong

et al. 2015

ACS Appl. Mater. Interfaces

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Selective tuning of the Gilbert damping constant, α, in a NiFe/Cu/FeCo spin-valve trilayer has been achieved by inserting different rare-earth nanolayers adjacent to the ferromagnetic layers. Frequency dependent analysis of the ferromagnetic resonances shows that the initially small magnitude of α in the NiFe and FeCo layers is improved by Tb and Gd insertions to various amounts. Using the element-specific technique of X-ray magnetic circular dichroism, we find that the observed increase in α can be attributed primarily to the orbital moment enhancement of Ni and Co, rather than that of Fe. The amplitude of the enhancement depends on the specific rare-earth element, as well as on the lattice and electronic band structure of the transition metals. Our results demonstrate an effective way for individual control of the magnetization dynamics in the different layers of the spin-valve sandwich structures, which will be important for practical applications in high-frequency spintronic devices.

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“…Ion bombardment is known to stimulate production of point defects, such as vacancies and interstitials [32], which enhance the mobility and reactivity of oxygen anions and metal cations in materials. Areas inside the squares thereby have a higher surface oxidation rate, which leads to a lower magnetic anisotropy energy (MAE) and hence a smaller H c [33,34,13,35,36] inside the squares than that outside, as shown in Fig. 2(a).…”

Section: Preceding Magnetization Reversal In Plasma-pretreated Areas ...mentioning

confidence: 99%

Dependence of magnetic domain patterns on plasma-induced differential oxidation of CoPd thin films

Wang,

Liu,

Chuang

et al. 2021

Preprint

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We demonstrate the evolution of the micro-patterned magnetic domains in CoPd thin films pretreated with e-beam lithography and O 2 plasma. During the days-long oxidation, significantly different behaviors of the patterned magnetic domains under magnetization reversal are observed via magneto-optic Kerr effect microscopy on different days. The evolution of the magnetic behaviors indicate critical changes in the local magnetic anisotropy energies due to the Co oxides that evolve into different oxide forms, which are characterized by micro-area X-ray absorption spectroscopy and X-ray photoelectron spectroscopy. The coercive field of the area pre-exposed to plasma can decrease to a value 10 Oe smaller than that unexposed to plasma, whereas after a longer duration of oxidation the coercive field can instead become larger in the area pre-exposed to plasma than that unexposed, leading to an opposite magnetic pattern. Various forms of oxidation can therefore provide an additional dimension for magnetic-domain engineering to the current conventional lithographies.

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Microscopic origin of the reduced magnetocrystalline anisotropy with increasing oxide content in Co₈₀Pt₂₀ : oxide thin films

Cited by 5 publications

References 53 publications

Ferromagnet/Two-Dimensional Semiconducting Transition-Metal Dichalcogenide Interface with Perpendicular Magnetic Anisotropy

Ferromagnet/Two-Dimensional Semiconducting Transition-Metal Dichalcogenide Interface with Perpendicular Magnetic Anisotropy

Selective Tuning of Gilbert Damping in Spin-Valve Trilayer by Insertion of Rare-Earth Nanolayers

Dependence of magnetic domain patterns on plasma-induced differential oxidation of CoPd thin films

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Microscopic origin of the reduced magnetocrystalline anisotropy with increasing oxide content in Co80Pt20 : oxide thin films

Cited by 5 publications

References 53 publications

Ferromagnet/Two-Dimensional Semiconducting Transition-Metal Dichalcogenide Interface with Perpendicular Magnetic Anisotropy

Ferromagnet/Two-Dimensional Semiconducting Transition-Metal Dichalcogenide Interface with Perpendicular Magnetic Anisotropy

Selective Tuning of Gilbert Damping in Spin-Valve Trilayer by Insertion of Rare-Earth Nanolayers

Dependence of magnetic domain patterns on plasma-induced differential oxidation of CoPd thin films

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Microscopic origin of the reduced magnetocrystalline anisotropy with increasing oxide content in Co₈₀Pt₂₀ : oxide thin films