Thermal annealing of FePt thin films by millisecond plasma arc pulses

Inaba, Y.; Torres, Karen L.; Cole, Amanda; Vanfleet, Richard; Ott, Ronald D; Klemmer, T. J.; Harrell, J. W.; Thompson, Gregory B.

doi:10.1016/j.jmmm.2009.03.019

Cited by 13 publications

(3 citation statements)

References 25 publications

(29 reference statements)

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“…The maximum H c of 12 kOe occurs at 32 J/cm 2 . These laser annealed order parameters are approximately equal to our previous work using 50 and 100 ms plasma arc pulsing of 20 and 100 nm FePt films but the laser annealed coercivity values are significantly higher [24]. These coercivity differences may relate to thickness dependence between the studies, peak applied temperature and/or processing method and is the subject of future work.…”

Section: Resultssupporting

confidence: 59%

FePt L10 ordering and grain growth using millisecond pulse laser processing

Inaba

Torres

Kang

et al. 2010

Journal of Magnetism and Magnetic Materials

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Section: Resultssupporting

confidence: 59%

FePt L10 ordering and grain growth using millisecond pulse laser processing

Inaba

Torres

Kang

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…Since these edges have a “wedge” shape, proper selection of a region of a constant film thickness must be located because variations in the film thickness will change the scattering results. Prior to collecting SAED patterns, a scanning TEM-XEDS Pt-L and Si-K intensity line profile was collected to confirm constant film thickness (Inaba et al, 2009), as seen in Figure 3. The X-ray absorption in the film of Pt was negligible because the atomic number of Pt was larger than that of Fe.…”

Section: Experimental Methodsmentioning

confidence: 99%

Comparison of Simulated and Experimental Order Parameters in FePt—II

2011

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Eight FePt thin film specimens of various thicknesses, compositions, and order parameters have been analyzed to determine the robustness and fidelity of multislice simulations in determining the chemical order parameter via electron diffraction (ED). The shape of the simulated curves depends significantly on the orientation and thickness of the specimen. The ED results are compared to kinematical scattering order parameters, from the same films, acquired from synchrotron X-ray diffraction (XRD). For the specimens analyzed with convergent beam electron diffraction conditions, the order parameter closely matched the order parameter as determined by the XRD methodology. However, the specimens analyzed by selected area electron diffraction conditions did not show good agreement. This has been attributed to substrate effects that hindered the ability to accurately quantify the intensity values of the superlattice and fundamental reflections.

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“…12 According to their study, rapid-thermal-annealed FePt nanoparticles showed much higher coercivity than FePt nanoparticles annealed in a conventional furnace, despite the same annealing temperature. Other rapid heating methods such as nanosecond pulse laser 13 or the millisecond plasma arc pulse annealing method 14 have been reported, wherein a nano-or millisecond annealing time is enough to induce L1 0 ordering of FePt nanoparticles.…”

mentioning

confidence: 99%

Effect of Heating and Cooling Rates in Annealing for Preparation of L1₀-FePt Nanoparticles on Si Substrate

Yoshiki¹,

Asahi²,

Momma³

et al. 2019

ECS J. Solid State Sci. Technol.

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In order to obtain highly ordered L10-FePt nanoparticles for hard disk drive applications, the L10-phase transformation of chemically synthesized FePt nanoparticles deposited on a naturally oxidized Si substrate was investigated using rapid thermal annealing. The heating and cooling rates during annealing were changed logarithmically with a constant annealing temperature (800°C) and holding time (10 min). Almost completely ordered L10-FePt nanoparticles were confirmed by grazing incidence X-ray diffraction measurements, irrespective of the heating and cooling rates, and the amount of the silicide changed in response to both. Nearly pure L10-FePt was obtained when rapid heating (more than 780 K/min) and rapid cooling (more than 290 K/min) were applied. L10-FePt degraded into Fe3Si and PtSi when the cooling rate was lower than 7.8 K/min. Rapid heating as well as rapid cooling of FePt nanoparticles can provide a facile route for the high-throughput production of L10-FePt-based high-density magnetic recording media.

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Thermal annealing of FePt thin films by millisecond plasma arc pulses

Cited by 13 publications

References 25 publications

FePt L10 ordering and grain growth using millisecond pulse laser processing

FePt L10 ordering and grain growth using millisecond pulse laser processing

Comparison of Simulated and Experimental Order Parameters in FePt—II

Effect of Heating and Cooling Rates in Annealing for Preparation of L1₀-FePt Nanoparticles on Si Substrate

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Thermal annealing of FePt thin films by millisecond plasma arc pulses

Cited by 13 publications

References 25 publications

FePt L10 ordering and grain growth using millisecond pulse laser processing

FePt L10 ordering and grain growth using millisecond pulse laser processing

Comparison of Simulated and Experimental Order Parameters in FePt—II

Effect of Heating and Cooling Rates in Annealing for Preparation of L10-FePt Nanoparticles on Si Substrate

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Product

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Effect of Heating and Cooling Rates in Annealing for Preparation of L1₀-FePt Nanoparticles on Si Substrate