Thickness dependence of the effective damping in epitaxial Fe3O4/MgO thin films

Serrano-Guisan, S.; Wu, Han; Boothman, Catherine; Abid, Mohamed; Chun, Byong Sun; Shvets, I. V.; Schumacher, H. W.

doi:10.1063/1.3531989

Cited by 28 publications

(14 citation statements)

References 33 publications

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“…27 For thin films, there is a clear trend visible for a to decrease with decreasing size 21-23 and in Ref. 22, an upper limit for a in iron oxide thin films of 0.0365 is found. We argue that in MNP this value is expected to be even significantly smaller because of the nanoscale dimensions in every direction.…”

Section: Resultsmentioning

confidence: 87%

Regarding the Néel relaxation time constant in magnetorelaxometry

Leliaert

Coene

Crevecoeur

et al. 2014

Journal of Applied Physics

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Quantitative analysis of interaction between domain walls and magnetic nanoparticlesMagnetorelaxometry (MRX) is a sensitive measurement technique frequently employed in biomedical applications for imaging magnetic nanoparticles (MNP). In this article, we employ a first principles model to investigate the effects of different iron oxide MNP sample properties on the N eel relaxation time constant s N in magnetorelaxometry. Using this model, we determined that dipolar interactions start to have an impact on the MRX signal from Fe concentrations of 100 mmol/l and result in a smaller s N . Additionally, the micromagnetic damping constant, closely related to s N , was found to be between 0.0005 and 0.002 by comparison to an MRX measurement of iron oxide particles. This is significantly lower compared to the bulk value of 0.07 for this material. V C 2014 AIP Publishing LLC. [http://dx.

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Section: Resultsmentioning

confidence: 87%

Regarding the Néel relaxation time constant in magnetorelaxometry

Leliaert

Coene

Crevecoeur

et al. 2014

Journal of Applied Physics

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“…This result is one order of magnitude smaller than the reported values for other similar systems, such as YIG/Pt thin films. 6,25 The difference can be explained considering magnetite thin films' higher damping constant than YIG, 6,26 since K is considered to scale as the inverse of the damping constant. 27 Previous studies 11 have shown that SSE is suppressed at high magnetic fields, suggesting that low frequency magnons are important in SSE.…”

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confidence: 99%

Characteristic length scale of the magnon accumulation in Fe3O4/Pt bilayer structures by incoherent thermal excitation

Anadón

Ramos

Lucas

et al. 2016

Applied Physics Letters

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The dependence of Spin Seebeck effect (SSE) with the thickness of the magnetic materials is studied by means of incoherent thermal excitation. The SSE voltage signal in Fe3O4/Pt bilayer structure increases with the magnetic material thickness up to 100 nm, approximately, showing signs of saturation for larger thickness. This dependence is well described in terms of a spin current pumped in the platinum film by the magnon accumulation in the magnetic material. The spin current is generated by a gradient of temperature in the system and detected by the Pt top contact by means of inverse spin Hall effect. Calculations in the frame of the linear response theory adjust with a high degree of accuracy the experimental data, giving a thermal length scale of the magnon accumulation (Λ) of 17 ± 3 nm at 300 K and Λ = 40 ± 10 nm at 70 K.

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“…On the other hand, the dynamic magnetic properties such as magnetic anisotropy and magnetization damping of Zn x Fe 3x O 4 thin films are less reported may be related to the difficulty of the ultrafast dynamic characterization. Fe 3 O 4 thin film has large Gilbert damping and weak magnetic anisotropy in nature [10,11]. Zn dopant in Zn x Fe 3x O 4 thin film can induce extrinsic damping and additional magnetic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn substitution in (111)-textured ZnxFe3−xO4 thin films on magnetization dynamics

Yuan

Zheng

Yin

et al. 2017

Journal of Alloys and Compounds

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The strong (111)-textured Zn x Fe 3x O 4 thin films were grown on SiO 2 -terminated silicon substrates using pulsed laser deposition. X-ray diffraction and high resolution transmission electron microscopy clearly show the column growth structure along the film thickness direction in [111] crystalline orientation for every grain column. With the introduction of texture induced magnetic anisotropy in the free energy density model, we quantitatively determined the doping effect on the various anisotropies in (111)-textured Zn x Fe 3x O 4 films. The mechanisms of ferromagnetic resonance linewidth of Zn x Fe 3x O 4 thin films are investigated by the theoretical fitting, in which considering the contributions from intrinsic spin-orbit coupling, extrinsic compositions from two-magnon scattering and inhomogeneous broadening. It is found that the Gilbert damping coefficient  increases with increasing Zn substitution x from 0 to 0.3, indicating that the spin-orbit coupling of the Zn x Fe 3x O 4 thin films increases with the introduction of Zn impurities.

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Thickness dependence of the effective damping in epitaxial Fe3O4/MgO thin films

Cited by 28 publications

References 33 publications

Regarding the Néel relaxation time constant in magnetorelaxometry

Regarding the Néel relaxation time constant in magnetorelaxometry

Characteristic length scale of the magnon accumulation in Fe3O4/Pt bilayer structures by incoherent thermal excitation

Effect of Zn substitution in (111)-textured ZnxFe3−xO4 thin films on magnetization dynamics

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