Structural and magnetic properties of near surface superparamagnetic Ni1-Fe  nanoparticles in SiO2 formed by low energy dual ion implantation with different fluences

Williams, G. V. M.; Kennedy, J.; Murmu, Peter P.; Rubanov, S.

doi:10.1016/j.apsusc.2018.01.277

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…The coercive field is 31 mT at 5 K and 12 mT at 300 K. The appearance of hysteresis at 300 K indicates that there are some nanoparticles that are too big to be superparamagnetic. While the ~5 nm nanoparticles are small enough to exhibit superparamagnetism [24,46,62], the ~35 nm nanoparticles are too large, and it is the larger nanoparticles that lead to hysteresis even at 300 K. The coercive field at 300 K is higher than that reported in bulk unannealed Ni (3 mT) [63] and Ni nanofibres [61]. However, it is similar to that reported for Ni 1-x Fe x nanoparticles with x = 0.2 and diameters of ~15 nm (12 mT) [54,57] and x = 0.25 with diameters of 23 nm (~10 mT) [58].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of orientated Ni0.89Fe0.11/polymer nanofibres with a bimodal nanoparticle size distribution by electrospinning and thermal processing

Nawaz

Williams

Coles

et al. 2022

Materials Today Communications

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Section: Resultsmentioning

confidence: 99%

“…Ni 1-x Fe x is interesting because bulk Ni 1− x Fe x is used in magnetic flux guiding applications [45]. It can have a very low magnetocrystalline anisotropy for x~0.26 and hence Ni 1-x Fe x nanoparticles with sizes up to ~60 nm could potentially have a T B lower than 300 K and magnetic susceptibilities > 1000 [46].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of orientated Ni0.89Fe0.11/polymer nanofibres with a bimodal nanoparticle size distribution by electrospinning and thermal processing

Nawaz

Williams

Coles

et al. 2022

Materials Today Communications

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“…TEM would be a suitable characterisation technique to complement XRD to verify he nature of the crystal structure post-implantation and should be performed in future work related to this project. It has been reported by Williams et al that clusters of metal precipitate in the top layer of the film, followed by a region immediately below with a lower concentration, have been observed for low energy (10 keV) implantation of Ni + into SiO2 at 4 x 10 16 ions/cm 2 [60]. It is worth pointing out that the 2𝜃 002 peak for wurtzite-ScxAl1-xN alloys has been reported at similar values for AlN for various concentrations, x = 0.06 [61,62] and 0 < x < 0.30 [10], therefore it is also possible that at the high fluences, the concentration of Sc may be high enough for alloying to occur, however TEM is needed to verify this for our films.…”

Section: Current-voltage Measurementsmentioning

confidence: 93%

The Effect of Helium and Scandium Ion Implantation on the Structural, Vibrational and Piezoelectric Properties of Aluminium Nitride Thin Films

Sharma¹

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Aluminium nitride (AlN) is one of the leading piezoelectric materials for commercial bulk acoustic wave devices due to its useful properties such as moderate piezoelectricity, high acoustic velocities and low thermal drift. In this thesis, possibilities of strain generation or alloy formation in AlN thin films are investigated with the aim to further increase the piezoelectric response. To this end, helium and scandium ions are implanted in the AlN films at different concentrations. The changes in the vibrational, structural and piezoelectric properties of the AlN thin films from the implantation are investigated using experimental techniques such as Raman spectroscopy, X-ray diffraction (XRD) and piezoelectric force microscopy (PFM). This study demonstrates that the ion beam implantation technique is well-suited to generate uniaxial strain along the c-axis, without modifying the strain in the a-axis basal-plane. We measure a strain increase of 1% for He and Sc at the highest fluence of 1 x 1017 ions/cm2. Interestingly, for both implantations, we observe a secondary phase created at fluences above 1 x 1016 ions/cm2 and above, which could mark an amorphization threshold. A possible interpretation is that for the He implantation, the secondary phase is from the formation of He bubbles in the lattice. For the case of Sc implantation this phase could be from formation of nano-crystalline Sc in the first few nanometres of the film or ScAlN alloying effects. We did not find evidence of an increase in the piezoelectric response for the He implantation. XRD scans revealed the implantation of He into the films generated uniaxial strain along the c-axis, with a simultaneous reduction in piezoelectric response as measured by PFM. The reduction in piezoelectricity is attributed to introduction of disorder in the lattice as confirmed by Raman spectroscopy. For the Sc implantation, a reduction in the measured amplitude from PFM for fluences of 1 x 1015 ions/cm2 and 5 x 1015 ions/cm2 is also attributed to disorder introduced by the implantation. We find that at a fluence of 1 x 1016 ions/cm2, the film has similar electromechanical responses as un-implanted which makes an interesting case to investigate its piezoelectric properties at higher fluences and after annealing.

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Reactive magnetron sputtered–assisted deposition of nanocomposite thin films with tuneable magnetic, electrical and interfacial properties

Ratnesh¹,

Singh

Pathak³

et al. 2020

J Nanopart Res

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Structural and magnetic properties of near surface superparamagnetic Ni1-Fe nanoparticles in SiO2 formed by low energy dual ion implantation with different fluences

Cited by 6 publications

References 37 publications

Synthesis of orientated Ni0.89Fe0.11/polymer nanofibres with a bimodal nanoparticle size distribution by electrospinning and thermal processing

Synthesis of orientated Ni0.89Fe0.11/polymer nanofibres with a bimodal nanoparticle size distribution by electrospinning and thermal processing

The Effect of Helium and Scandium Ion Implantation on the Structural, Vibrational and Piezoelectric Properties of Aluminium Nitride Thin Films

Reactive magnetron sputtered–assisted deposition of nanocomposite thin films with tuneable magnetic, electrical and interfacial properties

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