Temperature-dependent magnetic and structural ordering of self-assembled magnetic array of FePt nanoparticles

Medwal, Rohit; Sehdev, Neeru; Annapoorni, S.

doi:10.1007/s11051-013-1423-x

Cited by 17 publications

(13 citation statements)

References 19 publications

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“…The XRD result in Fig. 2(a) shows that the asprepared nanoparticles are in face centered cubic (FCC, A1, Fm3m) phase with a lattice parameter estimated to be 3.84 Å in agreement with the literature value [29]. The particles were annealed at 600°C, as FePt is known to undergo a phase transformation from FCC to FCT at this temperature.…”

Section: Resultssupporting

confidence: 80%

“…The metal precursors iron(III) acetylacetonate (Fe(acac) 3 ) and platinum(II) acetylacetonate (Pt(acac) 2 ) were co-reduced in the presence of 1,2 hexadecanediol as a reducing reagent and oleic acid and oleylamine as a surfactant. The details of the preparation of the FePt nanoparticles using the above-mentioned process have been reported earlier [27][28][29].…”

Section: Nanoparticle Synthesismentioning

confidence: 99%

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Effect of functionalization on positional ordering of 3 nm FePt nanoparticles: Langmuir–Blodgett monolayer

Medwal

Gogia

Thakar

et al. 2014

Surface and Coatings Technology

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Section: Resultssupporting

confidence: 80%

Section: Nanoparticle Synthesismentioning

confidence: 99%

Effect of functionalization on positional ordering of 3 nm FePt nanoparticles: Langmuir–Blodgett monolayer

Medwal

Gogia

Thakar

et al. 2014

Surface and Coatings Technology

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“…The fraction of hard and soft magnetic phases present in the annealed and irradiated film with fluence 5 Â 10 12 ions/ cm 2 were estimated by simulating the demagnetization curve of the corresponding hysteresis loop. A simple equation (1) containing "n" ferromagnetic components as given below [24][25][26] was used.…”

Section: Resultsmentioning

confidence: 99%

Engineering strain, densification, order parameter and magnetic properties of FePt thin films by dense electronic excitations

Gupta

Sehdev

Asokan

et al. 2014

Journal of Applied Physics

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FePt films prepared by DC sputtering on Si ⟨100⟩ substrates when annealed at 600 °C for 1 h exhibited a structurally ordered and magnetically hard L10 phase. These FePt films were exposed to dense electronic excitations by using 100 MeV oxygen ions as a function of increasing fluences. Such excitations induce pressure and result in the enhancement of order parameter by increasing strain on the FePt films. Apart from this, the surface morphological images from field emission scanning electron microscopy reveal a densification of the films consequent to irradiation and are correlated with the details obtained from Rutherford back scattering analysis. The variation in the values of coercivity correlates well with the change in volume percentage of face centered tetragonal and face centered cubic phase. A coercivity of 14.7 kOe with order parameter 0.92 is achieved at a fluence of 5 × 1012 ions/cm2. The theoretical simulation of the demagnetization curve shows a strong correlation of coercivity and order parameter between the experimentally obtained values with that of simulation. The effect of irradiation induced strain, the structural ordering and coercivity of FePt films as a function of fluences have been discussed.

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“…FePt nanoparticles were synthesized via polyol method, by chemical co-reduction of Fe(acac) 3 and Pt(acac) 2 compounds, using a reducing agent [17,18]. The mixture was heated up to 250°C under an N 2 atmosphere followed by refluxing at 250°C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…To stabilize and control the size of the nanoparticles, oleic acid and oleylamine were used as ligands [19]. After cooling down to the room temperature, purification was accomplished by ethanol, through centrifugation at 10,000 rpm for 12 min, in two stages consecutively [17]. Afterward, the nanoparticles were dispersed in hexane and renewed surfactants, and then the final centrifugation was done.…”

Section: Methodsmentioning

confidence: 99%

Size control of L12-FePt3 nanocrystals by spin-coating method

2016

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Annealing is one of the stages of FePt nanoparticles preparation, during which the transition to a compositionally ordered phase occurs. In order to size and shape control of the nanoparticles in the mentioned stage, it is needed that they be distributed on a suitable surface. In the present work, the spin-coating method is suggested for preparing monolayer from L1 2 -FePt 3 nanoparticles colloidal solution on SiO 2 /Si substrates. FePt 3 nanoparticles were gradually deposited as droplets on the center of a 500 rpm rotating substrate. This step was performed in hexane vapor atmosphere without any stopping time. The analyses revealed that a uniform surface distribution was formed so that, after annealing at 600°C for 1 h the 6.1 nm L1 2 -FePt 3 nanoparticles were spherical in shape with standard deviation of 1.5 nm.

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Temperature-dependent magnetic and structural ordering of self-assembled magnetic array of FePt nanoparticles

Cited by 17 publications

References 19 publications

Effect of functionalization on positional ordering of 3 nm FePt nanoparticles: Langmuir–Blodgett monolayer

Effect of functionalization on positional ordering of 3 nm FePt nanoparticles: Langmuir–Blodgett monolayer

Engineering strain, densification, order parameter and magnetic properties of FePt thin films by dense electronic excitations

Size control of L12-FePt3 nanocrystals by spin-coating method

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