A surfactant-assisted high energy ball milling technique to produce colloidal nanoparticles and nanocrystalline flakes in Mn–Al alloys

Saravanan, P.; Deepika, D.; Hsu, Jen‐Hwa; Vinod, V.T.P.; Černík, Miroslav; Kamat, S.V.

doi:10.1039/c5ra16550d

Cited by 10 publications

(3 citation statements)

References 53 publications

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“…The higher magnetization and coercivity at 5 K can be attributed to the decreased thermal fluctuations in magnetizations, similar behaviour was observed in our previous study [23]. Also, at 5 K the hysteresis curve of as-deposited film exhibits paramagnetic nature due to the presence of paramagnetic β-phase, although the influence of the βphase is negligible at 300 K due to thermal fluctuations of Mn spins [61].…”

Section: Non-irradiated Thin Filmssupporting

confidence: 87%

Perpendicularly magnetized ferromagnetism in Mn/Al bilayer thin films on Si substrates induced by temperature dependent ion beam mixing

Khanduri¹,

Khan²,

Dimri³

et al. 2021

Phys. Scr.

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The perpendicularly magnetized τ-phase was achieved in Mn/Al bilayer thin films by ion beam mixing using 400 keV Xe ions. The effect of annealing and irradiation on the structural, microstructural, and magnetic properties of Mn/Al bilayer thin films was investigated in the present study. Mn/Al bilayer thin films (thickness ∼97 nm) were deposited on silicon substrates by the evaporation technique. These as-deposited films were irradiated to the fluences of 5×10 16 and 1×10 17 ions cm −2 at three substrate temperatures (Room temperature∼300 K, 450 K, and 623 K). As-deposited films were also annealed at 450 K and 623 K for 5 h. The ferromagnetic τ-phase was enhanced in annealed and irradiated thin films confirmed from synchrotron x-ray diffraction patterns, MFM images, and magnetic hysteresis curves. The average grain size estimated from the AFM study was found in the range of 78-192 nm. The domain patterns obtained in MFM images confirmed the ferromagnetic nature of the annealed and irradiated films. The hysteresis curves measured at 5 K show the maximum coercivity (7111 Oe) for the sample annealed at 450 K and the highest value of saturation magnetization (60 emu cc −1 ) for the film irradiated to the fluence of 1×10 17 ions cm −2 at the substrate temperature of 450 K. Perpendicularly magnetized τ-phase was achieved in the films irradiated to the fluence of 1×10 17 ions cm −2 at different temperatures. The formation of the ferromagnetic phase by ion beam mixing can be attributed to the combined effect of ballistic mixing and thermal spike mechanisms. This study suggests that the ferromagnetic properties of MnAl thin films can be modified by selecting the proper annealing and irradiation conditions to make them useful for applications in spintronics and magnetic memory devices.

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Section: Non-irradiated Thin Filmssupporting

confidence: 87%

Perpendicularly magnetized ferromagnetism in Mn/Al bilayer thin films on Si substrates induced by temperature dependent ion beam mixing

Khanduri¹,

Khan²,

Dimri³

et al. 2021

Phys. Scr.

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“…The colloid was composed of Mn-Al nanocrystalline particles with a lamellar morphology. Magnetic measurements of these colloidal NPs demonstrated almost non-magnetic behavior at 300 K. 323 Low-temperature phase (LTP) Mn-Bi nanosheets/nanoflakes were also prepared via SA-HEBM with OAm/OAc surfactants. The authors investigated the effect of ball milling time on the coercivity of LTP Mn-Bi nanosheets.…”

Section: Mn-based Npsmentioning

confidence: 99%

Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles

et al. 2022

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“…BTO nanoparticles that were produced through a hydrothermal synthesis process with diameters of 50 nm, 100 nm, 200 nm, 300 nm, and 500 nm were provided by Sakai Chemical Industry Co., Ltd., (Japan). As-received BTO powders were de-agglomerated through a surfactant-assisted ball milling process [17,18] using tert-Butylphosphonic acid (tBuPA) as a surfactant, which has been shown to limit the re-agglomeration of BTO nanoparticles after ball milling [19]. Similar BTO nanoparticles have been extensively characterized using Fourier transform infrared spectroscopy (FTIR) [20], x-ray diffraction (XRD) [21], Raman spectroscopy [21], solid-state nuclear magnetic resonance [20], and transmission electron microscopy (TEM) [20,22].…”

Section: Fabricating and Measuring Bto-abs Nanocompositesmentioning

confidence: 99%

Investigating the dielectric constant of barium titanate in a polymer-matrix nanocomposite

et al. 2022

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Barium titanate (BTO) is a ferroelectric material used in capacitors because of its high bulk dielectric constant. However, the impact of the size of BTO on its dielectric constant is not yet fully understood and is highly contested. Here, we present an investigation into the dielectric constant of BTO nanoparticles with diameters ranging between 50 and 500 nm. BTO nanoparticles were incorporated into acrylonitrile butadiene styrene and injection molded into parallel plate capacitors, which were used to determine nanocomposite dielectric constants. The dielectric constants of BTO nanoparticles were obtained by combining experimental measurements with computational results from COMSOL simulations of ABS-matrix nanocomposites containing BTO. The dielectric constant of BTO was observed to be relatively constant at nanoparticle diameters as small as 200 nm but sharply declined at smaller nanoparticle sizes. These results will be useful in the development of improved energy storage and power conditioning systems utilizing BTO nanoparticles. Graphical abstract

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A surfactant-assisted high energy ball milling technique to produce colloidal nanoparticles and nanocrystalline flakes in Mn–Al alloys

Abstract: A surfactant assisted-high energy ball milling technique was employed to process Mn54Al46 alloy in the form of colloidal nanoparticles with non-magnetic nature and high-aspect ratio nanocrystalline flakes with interesting hard magnetic properties.

Cited by 10 publications

References 53 publications

Perpendicularly magnetized ferromagnetism in Mn/Al bilayer thin films on Si substrates induced by temperature dependent ion beam mixing

Perpendicularly magnetized ferromagnetism in Mn/Al bilayer thin films on Si substrates induced by temperature dependent ion beam mixing

Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles

Investigating the dielectric constant of barium titanate in a polymer-matrix nanocomposite

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