Determination of magnetic anisotropy constants and domain wall pinning energy of Fe/MgO(001) ultrathin film by anisotropic magnetoresistance

Hu, Bo; He, Wei; Ye, Jun; Tang, Jin; Zhang, Yongsheng; Ahmad, Syed Sheraz; Zhang, Xiang-Qun; Cheng, Zhao‐Hua

doi:10.1038/srep14114

Cited by 15 publications

(8 citation statements)

References 26 publications

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“…Samples were prepared via molecular beam epitaxy with a chamber base pressure of 2 10 10´mbar [25]. Prior to deposition, MgO(001) substrates were annealed at 700°C for 2 h. 6 nm Fe films were then deposited using an electron-beam gun, followed by the deposition of Pd films, labeled as Pd(t Pd )/Fe(6 nm), where t Pd indicates the Pd thickness in nanometers.…”

Section: Methodsmentioning

confidence: 99%

“…It has been revealed that the films were grown with the epitaxial relationship Pd(001)〈110〉||Fe(001)〈100〉||MgO(001)〈110〉 (see the inset of figure 1(b)). For comparison, the reference sample, a 6 nm Fe film, was also prepared on MgO(001) substrate with Fe(001)〈100〉|| MgO(001)〈110〉 [25]. 3.5 nm Cu was deposited nonepitaxially on the Fe film to prevent the oxidation of Fe atoms [26][27][28].…”

Section: Methodsmentioning

confidence: 99%

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Isotropic non-local Gilbert damping driven by spin pumping in epitaxial Pd/Fe films on MgO(001) substrates

Liu

et al. 2019

New J. Phys.

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Although both theoretical predictions and experimental observations have demonstrated that the Gilbert damping is anisotropic at ferromagnet/semiconductor interface possessing robust interfacial spin-orbit coupling, it is not well understood whether non-local Gilbert damping driven by spin pumping in heavy metal/ferromagnetic metallic bilayers is anisotropic or not. Here, we investigated the angular and frequency dependence of magnetic relaxation in epitaxial Pd/Fe films on MgO(001) substrates. After disentangling parasitic contributions, we unambiguously observe that the non-local Gilbert damping is isotropic in the Fe(001) plane, suggesting that the spin transport across the Pd/Fe interface is independent of the Fe magnetization orientation. First principles calculations reveal that the effective spin mixing conductance of the Pd/Fe interface is nearly invariant for different magnetization directions, in good agreement with the experimental observations. These results offer valuable insight into spin transport in metallic bilayers, and facilitate the development of nextgeneration spintronic devices.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Isotropic non-local Gilbert damping driven by spin pumping in epitaxial Pd/Fe films on MgO(001) substrates

Liu

et al. 2019

New J. Phys.

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“…with the easy direction along the [1 0 0] crystal direction of the Fe film (see figure 4). In general, the com petition between fourfold and twofold anisotropy contrib utions depends on different parameters [25][26][27][28][29][30][31][32][33], intrinsic ones such as angle of deposition [25,30], substrate morphologhy [27][28][29]32], and ferromagnetic thicknesses [27,29,31] and, or extrinsic ones, such as temperature. With respect to the latter, different temperaturedependent strength would result in a spinreorientation transition.…”

Section: Resultsmentioning

confidence: 99%

Direct observation of temperature-driven magnetic symmetry transitions by vectorial resolved MOKE magnetometry

Cuñado

Pedrosa

Ajejas

et al. 2017

J. Phys.: Condens. Matter

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Angle- and temperature-dependent vectorial magnetometry measurements are necessary to disentangle the effective magnetic symmetry in magnetic nanostructures. Here we present a detailed study on an Fe(1 0 0) thin film system with competing collinear biaxial (four-fold symmetry) and uniaxial (two-fold) magnetic anisotropies, carried out with our recently developed full angular/broad temperature range/vectorial-resolved magneto-optical Kerr effect magnetometer, named TRISTAN. The data give direct views on the angular and temperature dependence of the magnetization reversal pathways, from which characteristic axes, remanences, critical fields, domain wall types, and effective magnetic symmetry are obtained. In particular, although the remanence shows four-fold angular symmetry for all investigated temperatures (15 K-400 K), the critical fields show strong temperature and angular dependencies and the reversal mechanism changes for specific angles at a given (angle-dependent) critical temperature, showing signatures of an additional collinear two-fold symmetry. This symmetry-breaking is more relevant as temperature increases to room temperature. It originates from the competition between two anisotropy contributions with different symmetry and temperature evolution. The results highlight the importance of combining temperature and angular studies, and the need to look at different magnetic parameters to unravel the underlying magnetic symmetries and temperature evolutions of the symmetry-breaking effects in magnetic nanostructures.

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“…Previous work reported that the Fe thin films on MgO(001) substrates have four-fold symmetry with strong magnetic anisotropy. [45] Figure 6(a) clearly shows that the angle dependent normalized remanence of the normally deposited (α = 0 • ) sample exhibits four-fold symmetry. When the Fe film thickness is large (50 ML), the four-fold cubic anisotropy is dominant to the UMA caused by oblique deposition.…”

Section: Moke Analysismentioning

confidence: 97%

Thickness dependent manipulation of uniaxial magnetic anisotropy in Fe-thin films by oblique deposition

Gul

et al. 2018

Chinese Phys. B

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The uniaxial magnetic anisotropy of obliquely deposited Fe(001)/Pd film on MgO(001) substrate is investigated as a function of deposition angle and film thickness. The values of incidence angle of Fe flux relative to surface normal of the substrate are 0 • , 45 • , 55 • , and 70 • , respectively. In-situ low energy electron diffraction is employed to investigate the surface structures of the samples. The Fe film thicknesses are determined to be 50 ML, 45 ML, 32 ML, and 24 ML (1 ML = 0.14 nm) by performing x-ray reflectivity on the grown samples, respectively. The normalized remanent magnetic saturation ratio and coercivity are obtained by the longitudinal surface magneto-optical Kerr effect. Here, the magnetic anisotropy constants are quantitatively determined by fitting the anisotropic magnetoresistance curves under different fields. These measurements show four-fold cubic anisotropy in a large Fe film thickness (50 ML) sample, but highly in-plane uniaxial magnetic anisotropies in thin films (24 ML and 32 ML) samples. In the obliquely deposited Fe films, the coercive fields and the uniaxial magnetic anisotropies (UMAs) increase as the deposition angle becomes more and more tilted. In addition, the UMA decreases with the increase of the Fe film thickness. Our work provides the possibility of manipulating uniaxial magnetic anisotropy, and paves the way to inducing UMA by oblique deposition with smaller film thickness.

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Determination of magnetic anisotropy constants and domain wall pinning energy of Fe/MgO(001) ultrathin film by anisotropic magnetoresistance

Cited by 15 publications

References 26 publications

Isotropic non-local Gilbert damping driven by spin pumping in epitaxial Pd/Fe films on MgO(001) substrates

Isotropic non-local Gilbert damping driven by spin pumping in epitaxial Pd/Fe films on MgO(001) substrates

Direct observation of temperature-driven magnetic symmetry transitions by vectorial resolved MOKE magnetometry

Thickness dependent manipulation of uniaxial magnetic anisotropy in Fe-thin films by oblique deposition

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