Origin of the increased resistivity in epitaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>films

Eerenstein, W.; Palstra, Thomas; Hibma, T.; Celotto, S.

doi:10.1103/physrevb.66.201101

Cited by 211 publications

(202 citation statements)

References 14 publications

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“…3 is similar to the one reported for (100) oriented films which is C = 2.23 × 10 −4 nm 0.5 (Ref. 19). The domain sizes calculated for our (110) oriented films are found to be on average 9.7% smaller than the corresponding domain sizes reported in the case of (100) oriented films for the same film thickness.…”

supporting

confidence: 76%

Anomalous magnetization reversal due to proximity effect of antiphase boundaries

Sofin

Shvets

2011

Phys. Rev. B

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Here we report anomalous double switching hysteresis loop and high coercivity (∼0.1 T) in Fe 3 O 4 (110) thin films. Our analytical model based on spin chains confined within small antiphase boundary domains (APBDs) suggests a significant proximity effect of antiferromagnetic antiphase boundaries (APBs). Furthermore, the calculated domain size (D) follows the well-known scaling relation D = C √ t. The results suggest that the interface exchange coupling between neighboring magnetic domains through antiferromagnetic APBs is responsible for the double switching hysteresis. Our findings could help advance the studies of anomalous properties of magnetic materials originating from growth defects. This effect can be utilized for the tunability of exchange bias in devices.

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supporting

confidence: 76%

Anomalous magnetization reversal due to proximity effect of antiphase boundaries

Sofin

Shvets

2011

Phys. Rev. B

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“…A decrease in T V for decreasing Fe 3 O 4 thicknesses is observed, which has been previously reported by other authors, 7,19,33 and explained as a slight nonstoichiometry of the films 33,34 or strain due to the epitaxial growth on the substrate. 7 Recently, it has been suggested 8,19 that in ultrathin films where the APBs domain size is small, the long-range order of the Fe 2+ and Fe 3+ ions at the octahedral sites, necessary for the Verwey transition to occur, can be inhibited, 35 producing a decrease in T V . Indeed, this decrease in the Verwey transition temperature as a function of Fe 3 O 4 film thickness ͑t͒ can be fitted to the phenomenological expression given by Eq.…”

Section: Resultsmentioning

confidence: 99%

“…2͒ and its characteristic metal-insulator transition at 120 K ͑Verwey transition͒. [3][4][5] Differences between some properties of bulk magnetite and epitaxial thin films have been observed, such as an increased resistivity with decreasing film thickness, [6][7][8] negative magnetoresistance, [9][10][11] decreased and broadened Verwey transition temperature ͑T V ͒, 7,12,13 superparamagnetism in ultrathin films, 14,15 decreased saturation magnetization, [16][17][18][19] and anomalous, planar, and ordinary Hall effects. [20][21][22] This anomalous behavior has often been associated to the film microstructure and the presence of structural growth defects called antiphase boundaries ͑APBs͒.…”

Section: Introductionmentioning

confidence: 99%

“…Although it was first believed that the APBs formed at the very first stages of the growth and that the domain size was constant, 15 Eerenstein et al 8,23 demonstrated that the APBs domain size ͑D͒ increases significantly with deposition time and therefore, the antiphase domains are largest in the thickest magnetite films due to the prolonged deposition time, following:…”

Section: Introductionmentioning

confidence: 99%

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Origin of the giant magnetic moment in epitaxialFe3O4thin films

et al. 2010

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We study the enhanced magnetic moment observed in epitaxial magnetite ͑Fe 3 O 4 ͒ ultrathin films ͑t Ͻ 15 nm͒ grown on MgO ͑001͒ substrates by means of pulsed laser deposition. The Fe 3 O 4 ͑001͒ thin films exhibit high crystallinity, low roughness, and sharp interfaces with the substrate, and the existence of the Verwey transition at thicknesses down to 4 nm. The evolution of the Verwey transition temperature with film thickness shows a dependence with the antiphase boundaries density. Superconducting quantum interference device ͑SQUID͒ and vibrating sample magnetometry measurements in ultrathin films show a magnetic moment much higher than the bulk magnetite value. In order to study the origin of this anomalous magnetic moment, polarized neutron reflectivity ͑PNR͒, and x-ray magnetic circular dichroism ͑XMCD͒ experiments have been performed, indicating a decrease in the magnetization with decreasing sample thickness. X-ray photoemission spectroscopy measurements show no metallic Fe clusters present in the magnetite thin films. Through inductively coupled plasma mass spectroscopy and SQUID magnetometry measurements performed in commercial MgO ͑001͒ substrates, the presence of Fe impurities embedded within the substrates has been observed. Once the substrate contribution has been corrected, a decrease in the magnetic moment of magnetite thin films with decreasing thickness is found, in good agreement with the PNR and XMCD measurements. Our experiments suggest that the origin of the enhanced magnetic moment is not intrinsic to magnetite but due to the presence of Fe impurities in the MgO substrates.

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“…Antiphase boundary disorder has been well-characterized in spinel films grown on MgO substrates via transmission electron microscopy analysis. 21,22 These defects disrupt Ti-O-Ti octahedral bond ordering in an analogous manner to the disruption of Fe-O-Fe bond ordering in Fe 3 O 4 , 23,24 and such Ti network disorder would influence carrier transport in LTO films. On the other hand, Mg interdiffusion combined with antiphase boundary-related Ti disorder has a much larger effect on both normal state and superconducting properties.…”

Section: Introductionmentioning

confidence: 99%