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Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties
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Image of FIG. 1.
FIG. 1.

Schematic of the nanocluster deposition system. TMP indicates turbo molecular pump.

Image of FIG. 2.
FIG. 2.

XRD spectrum of nanocluster film on MgO (M1-D) before and after irradiation. Both datasets are subtracted from their backgrounds. Inset text shows the crystallite sizes obtained from XRD line broadening.

Image of FIG. 3.
FIG. 3.

(a) Helium ion micrograph of sample M1-D cross-section prior to Si ion irradiation and (b) 3.0 MeV He RBS spectrum for the samples, together with simulation data (SIMNRA).

Image of FIG. 4.
FIG. 4.

TEM micrographs of unirradiated (a,c) and ion irradiated (b,d) core-shell nanoparticles from sample M1-D. Fe core in (c) is ∼12 nm, and in (d)is ∼27 nm.

Image of FIG. 5.
FIG. 5.

300 K magnetization (a) nanoclusters on Si; (b) close-up of near zero field region of (a); (c) and (d): effect of irradiation on (c) M1-D and (b) M2, where NC mass normalized curve indicated for irradiated sample.

Image of FIG. 6.
FIG. 6.

First order reversal curve diagrams (300 K). (a) unirradiated 7 nm core with 2 nm FeO shell (#2); (b) unirradiated 10 nm core with 2 nm FeO shell (#4); (c) irradiated 7 nm core with 12 nm FeO “shell” (S2-i); and (d) irradiated single phase 23 nm FeO (S1-i).


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Table I.

Synthesis conditions for granular nanocluster films (aggregation distance was constant at 310 mm).

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Table II.

Crystalline phases and average crystallite sizes for granular films before and after irradiation. Parentheses indicate standard deviation in the last digit. Note that the irradiated values marked with asterisk (*) are the crystallite sizes, and given the TEM results should be understood to represent “matrix” crystallite size and not necessarily shell thickness, which they do for the unirradiated case (N/A is not applicable; “-” indicates quantity was not measured).

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Table III.

Details of the identified phases in the films before and after ion irradiation (-u = unirradiated; -i = irradiated).

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Table IV.

Magnetic parameters at 300 K (#Saturation is defined as the 10 kOe data point. The sample still appears to have a small paramagnetic component, which was not removed. The diamagnetic component of the MgO was not removed either, but it is a very small effect. Note that the saturation and the remanence are normalized to the mass of the NC film only, and the FeO underlying film is not treated here. It should be noted that the total moment of the PLD FeO underlying film was <10% of the total moment (emu) of the combined system with NC for the thick PLD film and <1% of the total moment for the NC with thin PLD FeO film.).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties