Magnetic properties of Fe-Co nitride thin films

Takahashi, S.; Kume, Minoru; Matsuura, K.

doi:10.1109/tmag.1987.1065216

Cited by 9 publications

(4 citation statements)

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“…x Ni x N particles decreased from 14.43 emu/g for x = 0.1 to 12.42 emu/g for x = 0.3, but were higher than 10.320 emu/g for pure ε-Fe 3 N. The addition of Ni in ε-Fe 3 N leads to the suppression of nitridation process, but induces the precipitation of nitrogen deficient phase like γ'-Fe 4 N, only if the concentration of Ni is above x = 0.4 [6]. The difference between the σ s values measured at 5 K and 300 K is also due to the fact that with increase of temperature, the thermal energy is increased resulting in the fluctuation of the magnetization orientation (superparamagnetic relaxation KV < kT).…”

Section: Resultsmentioning

confidence: 85%

“…Although reports are available on substitution of various elements into γ'-Fe 4 N, very scanty reports are available for substitution into ε-Fe 3 N. The recent study of Co and Ni substitution is known to stabilize the giant magnetic phases like γ'-Fe 4 N and α''-Fe 16 N 2 and ε-Fe 3 N and make them resistant to oxidation [3][4][5]. However, Co was substituted into ε-Fe 2~3 N thin films, where Fe atoms are randomly replaced by the Co atoms [6,7]. In this study, Ni has been substituted into ε-Fe 3 N at lower temperatures to give the nanocrystalline pseudo-binary ε-Fe 3-x Ni x N system with x = 0.1 to 0.3 and these particles are explored for their structural and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of ε ‐Fe _3–x Ni _x N nanoparticles

Gajbhiye¹,

Bhattacharyya

2004

phys. stat. sol. (c)

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The pseudo-binary ε-Fe 3-x Ni x N system with x = 0.0 to 0.3 in the nanosize range (20-25 nm) is studied for magnetic interactions among the particles. The decomposition of citrate precursors in air and nitridation in NH 3 gas gives the desired compositions. For all the compositions, the X-ray diffraction patterns are indexed based on the ε-Fe 3 N hexagonal phase with the space group P6 3 /mmc. The magnetization vs. field curves do not saturate even at higher applied fields, showing super-paramagnetic nature, which is confirmed from 57 Fe Mössbauer spectroscopy experiments. The room temperature saturation magnetization (σ s ) and Curie temperature (T c ) increase with the increase of Ni concentration from x = 0.1 to 0.3. However, the σ s values at 5 K decrease steadily but slightly with the increase of Ni content from x = 0.1 to 0.3. The zero-field cooled (ZFC) and field cooled (FC) measurements are recorded from room temperature down to 10 K, with an applied field of 0.025 Tesla and these curves bifurcate at a higher temperature below 300 K because of large inter-particle interactions. The blocking temperature (T B ) is measured from the magnetic measurements and is found to increase from 20.35 K to 28.14 K for x = 0.1 to 0.3 compositions respectively.

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Magnetic properties of ε ‐Fe _3–x Ni _x N nanoparticles

Gajbhiye¹,

Bhattacharyya

2004

phys. stat. sol. (c)

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“…This increase of σ s values may be due to decrease of minority (spin down) d-states near Fermi energy and the increase of majority (spin up) d states. Also, the effect of the addition of Ni is to suppress the nitridation of Fe, and hence the σ s at 300 K increases with the increase of Ni content [8]. For the representative ε-Fe 2.4 Co 0.6 N and ε-Fe 2.6 Ni 0.4 N systems, σ s increases with the lowering of temperature from 300 to 5 K. The σ s values for ε-Fe 2.4 Co 0.6 N system at 300, 70 and 5 K at an applied field of 1 T are 55.37, 86.64 and 92.93 emu/g, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Upon substitution of other ferromagnetic elements into ε-Fe 3 N, it is expected to change the magnetic properties significantly. Although substitutions of other elements into γ -Fe 4 N has been reported in the literature [5][6][7], not much has been studied for the substitutions in ε-Fe 3 N. However, Takahashi et al studied the substitution of Co into ε-Fe 3 N [8,9]. Moreover ε-Fe 3 N in the nanoparticle form will have magnetic properties quite different from the bulk, since the various intrinsic magnetic properties (σ s , T c , H c , H f ) are found to depend on the particle size.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Co and Ni Substituted ɛ-Fe3N Nanoparticles

2006

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In the present work, the nanostructured pseudo-binary ε-Fe 3−x CoxN and ε-Fe 3−x NixN (x = 0.0-0.8) systems (10-20 nm) are studied in detail for their intrinsic magnetic properties. These systems are indexed based on the hexagonal ε-Fe 3 N phase with the space group P6 3 /mmc. However, for the cobalt containing samples, x = 0.4-0.8, a mixture of hexagonal ε-Fe 3−x CoxN and bcc α-Fe phases are formed and for the nickel containing systems, x = 0.5-0.8, small amount of cubic γ -Fe 4−y NiyN is precipitated and these facts are supported by X-ray diffraction and 57 Fe Mössbauer spectroscopy studies. Mössbauer studies also confirm the random occupation of the substituent elements and the superparamagnetic nature of these particles. The intrinsic magnetic properties (σ s , T c ) are observed to vary with the Co and Ni contents. The low temperature magnetic properties are dominated by exchange bias phenomena and spin-glass like ordering, for these compositions.

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