A comprehensive study of ferromagnetic resonance and structural properties of iron-rich nickel ferrite (Ni Fe3−O4, x≤1) films grown by chemical vapor deposition

Pachauri, Neha; Khodadadi, Behrouz; Singh, Amit V.; Mohammadi, Jamileh Beik; Martens, R. L.; LeClair, P.; Mewes, Claudia; Mewes, Tim; Gupta, Arunava

doi:10.1016/j.jmmm.2016.05.045

Cited by 27 publications

(6 citation statements)

References 45 publications

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“…Temperature-dependent broadband FMR measurements were carried out using a custom designed setup capable of measuring in the frequency range 1-40 GHz [32][33][34] . The raw FMR spectra were fit using a derivative of a Lorentzian lineshape 35 in order to determine the resonance field (H res ) and the peak-to-peak linewidth (ΔH) as functions of frequency and temperature.…”

Section: Methodsmentioning

confidence: 99%

Enhanced spin pumping near a magnetic ordering transition

et al. 2017

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We study the temperature-dependent static and dynamic magnetic properties of polycrystalline permalloy (Ni 80 Fe 20 , Py)/Gd bilayers using DC magnetometry and broadband ferromagnetic resonance. Magnetometry measurements reveal that the 3-nm-thick Gd layers undergo a magnetic ordering transition below 100 K, consistent with finite size suppression of their Curie temperature. Upon cooling below this Gd ordering temperature, ferromagnetic resonance spectroscopy reveals a sharp increase in both the gyromagnetic ratio (γ) and effective Gilbert damping parameter (α) of the neighboring Py layers. The increase of γ is attributed to the onset of strong antiferromagnetic coupling between the Gd and Py layers as the Gd orders magnetically. We argue that the increase of α, on the other hand, can be explained by spin pumping into the rare earth layer when taking into account the increase of γ, the decrease of the Gd spin diffusion length as it orders, and, most significantly, the corresponding increase of the Py/Gd interfacial spin mixing conductance in the vicinity of the magnetic ordering transition. We propose that these observations constitute a qualitative confirmation of a recent theoretical prediction of spin sinking enhancement in this situation.2

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Section: Methodsmentioning

confidence: 99%

Enhanced spin pumping near a magnetic ordering transition

et al. 2017

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“…This composition is emphasized due to its possible use in multiferroic stacks, where its combination of properties is especially well suited. 24 We finally discuss variation in growth dynamics as a result of the orientation of the film. We believe that the possibility to deposit highly oriented thin films with a direction-controlled uniaxial spontaneous magnetization at low temperatures opens for expanding the toolbox of novel composite multiferroic functionality.…”

Section: Introductionmentioning

confidence: 99%

Control of growth orientation in as-deposited epitaxial iron-rich nickel ferrite spinel

Bratvold

Sønsteby

Nilsen

et al. 2019

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The authors here report epitaxial growth of the ferrimagnet Ni x Fe 3-x O 4 (NFO) by atomic layer deposition at low temperatures. Films grow epitaxially at a reactor temperature of 250°C and require no further postannealing treatment. (100)-, (110)-, and (111)-oriented thin films of NFO are attainable by using MgO (100)/LaAlO 3 (100), LaAlO 3 (110), and Al 2 O 3 (001) substrates, respectively. This means that the direction of the easy axis of magnetization relative to the film surface can be selected by the choice of substrate. The authors carefully study nucleation onset and growth dynamics by varying the number of cycles used to deposit the films. This shows that the initial growth is mostly inhibited by the Fe-species, creating a small composition gradient for the first few nanometers of the film. The growth rate varies as a result of the choice of substrate, explained by the direction of the close packed layers in the film. The authors believe that the ability to deposit epitaxial ferrimagnetic films with angstrom thickness control at low temperatures will make a major impact on the possibility to grow multiferroic stacks and on low temperature monolithic device integration where a spontaneously magnetized sample is required.

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“…The FMR frequency ( f ) in the YIG thin films as a function of the external magnetic field ( H ) along IP direction could be expressed as

\begin{matrix} f = \frac{γ}{2 π} \sqrt{(H + H_{i p, 3}) (H + H_{i p, 3} + 4 π M_{e f f})} \end{matrix}

where H ip,3 is the in‐plane three‐fold anisotropy field and M eff is the effective magnetization. [ 33 ] M eff is defined as the sum of the demagnetization field ( 4πM s ) and the perpendicular magnetic anisotropy field ( H op ) in the form of

\begin{matrix} 4 π M_{e f f} = 4 π M_{normals} - H_{o p} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Ferromagnetic Resonance Vector Magnetic Sensor with High Sensitivity and Ultrawide Working Range

Wen

et al. 2021

Adv Materials Technologies

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Large working range is of vital importance for magnetic sensors when exposed to complicated magnetic field profile, especially in automation and power industry where large field variation is frequently encountered. The design for traditional magnetic sensors, e.g., magnetoresistive and fluxgate magnetometers, utilizes ferromagnetic materials with ultrahigh permeability to maximize the field sensitivity, resulting in strictly confined dynamic range due to limited saturation field. Here, an integratable ferromagnetic resonance (FMR) prototype magnetic sensor with high sensitivity and theoretically unlimited working range is reported. An ultrawide working range (>450 mT) which is more than two orders larger than that of commercial sensors with similar field resolution is experimentally verified. Moreover, the FMR magnetometer is a vector sensor in contrast to the traditional scalar sensors based on magnetic resonance. With a navigating magnetic field of 50 μT (ca. the Earth's magnetic field), the resolution for azimuth angle is 0.006°. Compared with traditional nuclear magnetic resonance and electron paramagnetic resonance sensors with large size and high power consumption, the compact FMR sensor with large dynamic range and high sensitivity has much broader application prospects, especially in magnetically harsh environments.

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A comprehensive study of ferromagnetic resonance and structural properties of iron-rich nickel ferrite (Ni Fe3−O4, x≤1) films grown by chemical vapor deposition

Cited by 27 publications

References 45 publications

Enhanced spin pumping near a magnetic ordering transition

Enhanced spin pumping near a magnetic ordering transition

Control of growth orientation in as-deposited epitaxial iron-rich nickel ferrite spinel

Ferromagnetic Resonance Vector Magnetic Sensor with High Sensitivity and Ultrawide Working Range

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