2007
DOI: 10.1063/1.2714204
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Effect of growth temperature on the magnetic, microwave, and cation inversion properties on NiFe2O4 thin films deposited by pulsed laser ablation deposition

Abstract: First principles band structure calculations suggest that the preferential occupation of Ni2+ ions on the tetrahedral sites in NiFe2O4 would lead to an enhancement of the exchange integral and subsequently the Néel temperature and magnetization. To this end, we have deposited NiFe2O4 films on MgO substrates by pulsed laser deposition. The substrate temperature was varied from 700to900°C at 5mTorr of O2 pressure. The films were annealed at 1000°C for different times prior to their characterization. X-ray diffra… Show more

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Cited by 41 publications
(24 citation statements)
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“…The magnetization in nanocrystalline ferrite thin films normally is found to be different from bulk materials and is believed to be due to a changed cation distribution. 19,23,24 However, in case of the MnFe 2 O 4 films, any change in occupancy of Fe 3+ and Mn 2+ on A and B sites does not change the net magnetization. In spite of this, we observe an overall increase in the magnetization with increase in T S which is due to an increase in grain size.…”
Section: Discussionmentioning
confidence: 99%
“…The magnetization in nanocrystalline ferrite thin films normally is found to be different from bulk materials and is believed to be due to a changed cation distribution. 19,23,24 However, in case of the MnFe 2 O 4 films, any change in occupancy of Fe 3+ and Mn 2+ on A and B sites does not change the net magnetization. In spite of this, we observe an overall increase in the magnetization with increase in T S which is due to an increase in grain size.…”
Section: Discussionmentioning
confidence: 99%
“…Spinel ferrites with compositions Mn 0.5 Cu 0.5 Fe 2 − 2x Ni x Zr x O 4 (0.00 ≤ x ≤ 0.80) were prepared using metal nitrates and chemical coprecipitation technique by a similar procedure as reported in our earlier work [5]. X-rays diffractometer (XRD) (Stoe) was used by using CuKα radiation to investigate the structure of materials.…”
Section: Methodsmentioning
confidence: 99%
“…On the other hand, non-magnetic metal ions such as Zr is known to preferably occupy A-sites (i = 0) [4]. It is important to mention here that anomalous variations in the exclusive preferential occupation of many metal ions such as Mn 2+ and Ni 2+ ions have been reported, and correlated to the preparation and processing conditions employed to synthesize the nanoferrites [5][6][7].…”
Section: Introductionmentioning
confidence: 96%
“…[41,42] It is likely that the increase in grain size with increased deposition temperature from 600 8C to 800 8C results in films of decreasing coercivity, however the decreased coercivity for the 500 8C sample may have a different origin, including possible changes in cation ordering at low deposition temperatures. [21] Full Paper …”
Section: à3mentioning
confidence: 99%
“…MgAl 2 O 4 (100) and MgO (100) substrates with cubic normal spinel (a ¼ 0.808 nm) and fcc (2a ¼ 0.842 nm) structure, respectively, are used for film growth due to their close lattice match with nickel ferrite (lattice mismatch of 3% and 1%, respectively). [10,21,22] 2. Results and Discussion…”
Section: Full Papermentioning
confidence: 99%