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Remediation of Cr(VI) by biogenic magnetic nanoparticles: An x-ray magnetic circular dichroism study (2009)
Journal Article
Telling, N. D., Coker, V. S., Cutting, R. S., van der Laan, G., Pearce, C. I., Pattrick, R. A. D., …Lloyd, J. R. (2009). Remediation of Cr(VI) by biogenic magnetic nanoparticles: An x-ray magnetic circular dichroism study. Applied Physics Letters, 95(16), https://doi.org/10.1063/1.3249578

Biologically synthesized magnetite nanoparticles are studied using x-ray absorption and x-ray magnetic circular dichroism following exposure to hexavalent Cr solution. By examining their magnetic state, Cr cations are shown to exist in trivalent f... Read More about Remediation of Cr(VI) by biogenic magnetic nanoparticles: An x-ray magnetic circular dichroism study.

Tunnel magnetoresistance in epitaxially grown magnetic tunnel junctions using Heusler alloy electrode and MgO barrier (2009)
Journal Article
Tsunegi, S., Sakuraba, Y., Oogane, M., Telling, N. D., Shelford, L. R., Arenholz, E., …Ando, Y. (2009). Tunnel magnetoresistance in epitaxially grown magnetic tunnel junctions using Heusler alloy electrode and MgO barrier. Journal of Physics D: Applied Physics, 42(19), Article 195004. https://doi.org/10.1088/0022-3727/42/19/195004

Epitaxially grown magnetic tunnel junctions (MTJs) with a stacking structure of Co2MnSi/MgO/CoFe were fabricated. Their tunnel magnetoresistance (TMR) effects were investigated. The TMR ratio and tunnelling conductance characteristics of MTJs were co... Read More about Tunnel magnetoresistance in epitaxially grown magnetic tunnel junctions using Heusler alloy electrode and MgO barrier.

Harnessing the Extracellular Bacterial Production of Nanoscale Cobalt Ferrite with Exploitable Magnetic Properties (2009)
Journal Article
Coker, V. S., Telling, N. D., van der Laan, G., Pattrick, R. A. D., Pearce, C. I., Arenholz, E., …Lloyd, J. R. (2009). Harnessing the Extracellular Bacterial Production of Nanoscale Cobalt Ferrite with Exploitable Magnetic Properties. ACS Nano, 3(7), 1922-1928. https://doi.org/10.1021/nn900293d

Nanoscale ferrimagnetic particles have a diverse range of uses from directed cancer therapy and drug delivery systems to magnetic recording media and transducers. Such applications require the production of monodisperse nanoparticles with well-contro... Read More about Harnessing the Extracellular Bacterial Production of Nanoscale Cobalt Ferrite with Exploitable Magnetic Properties.

Reductive Microbial Transformations of Iron Oxides; Engineering Biominerals for the Remediation of Metals and Organics (2009)
Presentation / Conference
Lloyd, J., Coker, V., Cutting, R., Hofstetter, T., Mosberger, L., Telling, N., …Vaughan, D. (2009, January). Reductive Microbial Transformations of Iron Oxides; Engineering Biominerals for the Remediation of Metals and Organics. Presented at Awards Ceremony Speeches and Abstracts of the 19th Annual V.M. Goldschmidt Conference, Davos, Switzerland

Growth and magnetic characterization of Co nanoparticles obtained by femtosecond pulsed laser deposition (2009)
Journal Article
Cebollada, A., García Martín, J. M., Clavero, C., Balcells, L., Estradé, S., Arbiol, J., …van der Laan, G. Growth and magnetic characterization of Co nanoparticles obtained by femtosecond pulsed laser deposition. Physical review B: Condensed matter and materials physics, 79(1), https://doi.org/10.1103/physrevb.79.014414

We present a detailed study on the morphology and magnetic properties of Co nanostructures deposited onto oxidized Si substrates by femtosecond pulsed laser deposition. Generally, Co disks of nanometric dimensions are obtained just above the ablation... Read More about Growth and magnetic characterization of Co nanoparticles obtained by femtosecond pulsed laser deposition.

X-ray absorption and magnetic circular dichroism characterization of a novel ferromagnetic MnNx phase in Mn/Si3N4 multilayers (2008)
Journal Article
Céspedes, E., Huttel, Y., Martínez, L., de Andrés, A., Chaboy, J., Vila, M., …Prieto, C. (2008). X-ray absorption and magnetic circular dichroism characterization of a novel ferromagnetic MnNx phase in Mn/Si3N4 multilayers. Applied Physics Letters, 93(25), https://doi.org/10.1063/1.3050534

Ferromagnetism above room temperature has been observed in multilayered films for the first time. Characterization of the structural and electronic properties was performed to study the ferromagnetic behavior of this system. X-ray absorption spect... Read More about X-ray absorption and magnetic circular dichroism characterization of a novel ferromagnetic MnNx phase in Mn/Si3N4 multilayers.

Evidence of local moment formation in Co-based Heusler alloys (2008)
Journal Article
Telling, N. D., Keatley, P. S., van der Laan, G., Hicken, R. J., Arenholz, E., Sakuraba, Y., …Miyazaki, T. Evidence of local moment formation in Co-based Heusler alloys. Physical review B: Condensed matter and materials physics, 78(18), https://doi.org/10.1103/physrevb.78.184438

We examine the formation of local moments in Heusler alloys of the composition Co2MnZ (where Z=Si or Al) using the combined techniques of x-ray magnetic circular and linear dichroism. The existence of local moments in half-metallic Heusler alloys i... Read More about Evidence of local moment formation in Co-based Heusler alloys.

THE OXIDATION STATE OF COPPER AND COBALT IN CARROLLITE, CuCo2S4 (2008)
Journal Article
Pattrick, R. A., Coker, V. S., Pearce, C. I., Telling, N. D., & van der Laan, G. (2008). THE OXIDATION STATE OF COPPER AND COBALT IN CARROLLITE, CuCo2S4. Canadian Mineralogist, 46(5), 1317-1322. https://doi.org/10.3749/canmin.46.5.1317

Using X-ray absorption spectroscopy (XAS) at the Cu L2,3 and Co L2,3 edges, we demonstrate that the valence state of copper in the thiospinel carrollite (CuCo2S4) is Cu+ with a d count of Cu d9.8. The Co has a d count of d6.4, so that the highly cova... Read More about THE OXIDATION STATE OF COPPER AND COBALT IN CARROLLITE, CuCo2S4.

Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials (2008)
Journal Article
Huttel, Y., Navarro, E., Telling, N. D., van der Laan, G., Pigazo, F., Palomares, F. J., …Cebollada, A. Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials. Physical review B: Condensed matter and materials physics, 78(10), https://doi.org/10.1103/physrevb.78.104403

We show that Fe nanoislands capped with Al, Pd, and Pt protecting layers include an alloy at the interface with the capping layer, which explains the previously known capping layer dependence on the interparticle magnetic coupling. Vibrating sample m... Read More about Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials.

Probing the site occupancies of Co-, Ni-, and Mn-substituted biogenic magnetite using XAS and XMCD (2008)
Journal Article
Coker, V. S., Pearce, C. I., Pattrick, R. A., van der Laan, G., Telling, N. D., Charnock, J. M., …Lloyd, J. R. (2008). Probing the site occupancies of Co-, Ni-, and Mn-substituted biogenic magnetite using XAS and XMCD. American Mineralogist, 93(7), 1119-1132. https://doi.org/10.2138/am.2008.2681

Ferrimagnetic nanoparticles have many uses in industry including in magnetic recording media and transformers, however these particles are often expensive to synthesize. In this study, the Fe3+-reducing bacteria Geobacter sulfurreducens and Shewanell... Read More about Probing the site occupancies of Co-, Ni-, and Mn-substituted biogenic magnetite using XAS and XMCD.

Temperature dependence of the interface moments in Co2MnSi thin films (2008)
Journal Article
Telling, N. D., Keatley, P. S., Shelford, L. R., Arenholz, E., van der Laan, G., Hicken, R. J., …Miyazaki, T. (2008). Temperature dependence of the interface moments in Co2MnSi thin films. Applied Physics Letters, 92(19), https://doi.org/10.1063/1.2927482

X-ray magnetic circular dichroism (XMCD) is utilized to explore the temperature dependence of the interface moments in (CMS) thin films capped with aluminum. By increasing the thickness of the capping layer, we demonstrate enhanced interface sensi... Read More about Temperature dependence of the interface moments in Co2MnSi thin films.

Morphology and capping effects in the magnetic and magneto-optical properties of nanoparticulate Co films (2008)
Journal Article
Clavero, C., Martínez, L., García-Martín, A., García-Martín, J. M., Huttel, Y., Telling, N. D., …Armelles, G. Morphology and capping effects in the magnetic and magneto-optical properties of nanoparticulate Co films. Physical review B: Condensed matter and materials physics, 77(9), https://doi.org/10.1103/physrevb.77.094417

Magnetic and magneto-optical properties of Co films are studied as a function of the morphology and the capping layer. We show that the nanoparticulate structure of the Co films has a clear influence on the magnetic and magneto-optical properties of... Read More about Morphology and capping effects in the magnetic and magneto-optical properties of nanoparticulate Co films.

Controlled cobalt doping of magnetosomes in vivo (2008)
Journal Article
Staniland, S., Williams, W., Telling, N., Van Der Laan, G., Harrison, A., & Ward, B. (2008). Controlled cobalt doping of magnetosomes in vivo. Nature Nanotechnology, 3(3), 158-162. https://doi.org/10.1038/nnano.2008.35

Magnetotactic bacteria biomineralize iron into magnetite (Fe3O4) nanoparticles that are surrounded by lipid vesicles. These ‘magnetosomes’ have considerable potential for use in bio- and nanotechnological applications because of their narrow size and... Read More about Controlled cobalt doping of magnetosomes in vivo.

Rapid magnetosome formation shown by real-time x-ray magnetic circular dichroism (2007)
Journal Article
Staniland, S., Ward, B., Harrison, A., van der Laan, G., & Telling, N. (2007). Rapid magnetosome formation shown by real-time x-ray magnetic circular dichroism. Proceedings of the National Academy of Sciences of the United States of America, 104(49), 19524-19528. https://doi.org/10.1073/pnas.0704879104

Magnetosomes are magnetite nanoparticles formed by biomineralization within magnetotactic bacteria. Although there have been numerous genetic and proteomic studies of the magnetosome-formation process, there have been only limited and inconclusive st... Read More about Rapid magnetosome formation shown by real-time x-ray magnetic circular dichroism.

Cation site occupancy of biogenic magnetite compared to polygenic ferrite spinels determined by X-ray magnetic circular dichroism (2007)
Journal Article
Coker, V. S., Pearce, C. I., Lang, C., van der Laan, G., Pattrick, R. A., Telling, N. D., …Lloyd, J. R. (2007). Cation site occupancy of biogenic magnetite compared to polygenic ferrite spinels determined by X-ray magnetic circular dichroism. European Journal of Mineralogy, 19(5), 707-716. https://doi.org/10.1127/0935-1221/2007/0019-1758

Ferrite spinels, especially magnetite (Fe3O4), can be formed either by geological, biological or chemical processes leading to chemically similar phases that show different physical characteristics. We compare, for the first time, magnetite produced... Read More about Cation site occupancy of biogenic magnetite compared to polygenic ferrite spinels determined by X-ray magnetic circular dichroism.

Nano-spinel synthesis using Fe (III)-reducing bacteria (2007)
Presentation / Conference
Coker, V., Pearce, C., Pattrick, R., Laan, G., Telling, N., Charnock, J., & Arenholz, E. L. (2007, August). Nano-spinel synthesis using Fe (III)-reducing bacteria. Presented at Awards Ceremony Speeches and Abstracts of the 17th Annual V. M. Goldschmidt Conference, Cologne, Germany

Ion irradiation and thermally induced mixing of CoCrPt∕Cr multilayered films (2007)
Journal Article
Georgieva, M. T., Grundy, P. J., & Telling, N. D. (2007). Ion irradiation and thermally induced mixing of CoCrPt∕Cr multilayered films. Applied Physics Letters, 90(4), https://doi.org/10.1063/1.2432256

A set of multilayered films with variable layer thicknesses has been used in an investigation of interlayer mixing and “patterning” of samples with relatively high coercivity and in-plane magnetization. The multilayers with the highest coercivitie... Read More about Ion irradiation and thermally induced mixing of CoCrPt∕Cr multilayered films.