IRIS publication 117321829
Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures
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TY - JOUR - Barth, S.; Kazakova, O.; Estrade, S.; Hobbs, R. G.; Peiro, F.; Morris, M. A.; Holmes. J. D. - 2011 - December - Crystal Growth and Design - Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures - Published - () - 11 - 5253 - 5259 - A method for synthesizing Ge1xMnx/a-Si core-shell nanowires (x = 0.3(1)1.0(2)) using a supercritical fluid deposition technique, with a homogeneous distribution of manganese along the entire lengths of the crystalline Ge cores but not in the a-Si shells, is reported. Investigations into the magnetic properties of the heterostructured nanowires revealed a significant influence of the amorphous Si shell covering the surface of the core Ge0.997Mn0.003 nanowires compared to pristine Ge0.997Mn0.003 nanowires with no a-Si coating. The magnetic data revealed diminished values of both the remanence and the saturation magnetization for pristine Mn-doped Ge nanowires at higher temperatures when compared to the Ge1xMnx/a-Si coreshell nanowires, whereas both parameters increased as the temperature dropped down to 5 K. Differences in the temperature-dependent evolution of the coercivity were observed in the magnetically harder core-shell nanowires compared to the pristine Ge0.997Mn0.003 nanowires, showing a drop of 26% at 5 K vs roomtemperature compared to a drop of 66% for the pristine nanowires. The low dopant concentration (0.3(1)%) of Mn in the core-shell nanowires, combined with the observed ferromagnetic properties, suggests a combination of hole-mediated exchange and confinement processes are responsible for the observed properties. Our observations show the importance of a protective layer in covering the oxidation-sensitive dilute magnetic semiconductor nanowires. - http://pubs.acs.org/journal/cgdefu DA - 2011/12 ER -
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@article{V117321829, = {Barth, S. and Kazakova, O. and Estrade, S. and Hobbs, R. G. and Peiro, F. and Morris, M. A. and Holmes. J. D.}, = {2011}, = {December}, = {Crystal Growth and Design}, = {Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures}, = {Published}, = {()}, = {11}, pages = {5253--5259}, = {{A method for synthesizing Ge1xMnx/a-Si core-shell nanowires (x = 0.3(1)1.0(2)) using a supercritical fluid deposition technique, with a homogeneous distribution of manganese along the entire lengths of the crystalline Ge cores but not in the a-Si shells, is reported. Investigations into the magnetic properties of the heterostructured nanowires revealed a significant influence of the amorphous Si shell covering the surface of the core Ge0.997Mn0.003 nanowires compared to pristine Ge0.997Mn0.003 nanowires with no a-Si coating. The magnetic data revealed diminished values of both the remanence and the saturation magnetization for pristine Mn-doped Ge nanowires at higher temperatures when compared to the Ge1xMnx/a-Si coreshell nanowires, whereas both parameters increased as the temperature dropped down to 5 K. Differences in the temperature-dependent evolution of the coercivity were observed in the magnetically harder core-shell nanowires compared to the pristine Ge0.997Mn0.003 nanowires, showing a drop of 26% at 5 K vs roomtemperature compared to a drop of 66% for the pristine nanowires. The low dopant concentration (0.3(1)%) of Mn in the core-shell nanowires, combined with the observed ferromagnetic properties, suggests a combination of hole-mediated exchange and confinement processes are responsible for the observed properties. Our observations show the importance of a protective layer in covering the oxidation-sensitive dilute magnetic semiconductor nanowires.}}, = {http://pubs.acs.org/journal/cgdefu}, source = {IRIS} }
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AUTHORS | Barth, S.; Kazakova, O.; Estrade, S.; Hobbs, R. G.; Peiro, F.; Morris, M. A.; Holmes. J. D. | ||
YEAR | 2011 | ||
MONTH | December | ||
JOURNAL_CODE | Crystal Growth and Design | ||
TITLE | Synthesis and magnetic characterization of co-axial Ge1-xMnx/a-Si heterostructures | ||
STATUS | Published | ||
TIMES_CITED | () | ||
SEARCH_KEYWORD | |||
VOLUME | 11 | ||
ISSUE | |||
START_PAGE | 5253 | ||
END_PAGE | 5259 | ||
ABSTRACT | A method for synthesizing Ge1xMnx/a-Si core-shell nanowires (x = 0.3(1)1.0(2)) using a supercritical fluid deposition technique, with a homogeneous distribution of manganese along the entire lengths of the crystalline Ge cores but not in the a-Si shells, is reported. Investigations into the magnetic properties of the heterostructured nanowires revealed a significant influence of the amorphous Si shell covering the surface of the core Ge0.997Mn0.003 nanowires compared to pristine Ge0.997Mn0.003 nanowires with no a-Si coating. The magnetic data revealed diminished values of both the remanence and the saturation magnetization for pristine Mn-doped Ge nanowires at higher temperatures when compared to the Ge1xMnx/a-Si coreshell nanowires, whereas both parameters increased as the temperature dropped down to 5 K. Differences in the temperature-dependent evolution of the coercivity were observed in the magnetically harder core-shell nanowires compared to the pristine Ge0.997Mn0.003 nanowires, showing a drop of 26% at 5 K vs roomtemperature compared to a drop of 66% for the pristine nanowires. The low dopant concentration (0.3(1)%) of Mn in the core-shell nanowires, combined with the observed ferromagnetic properties, suggests a combination of hole-mediated exchange and confinement processes are responsible for the observed properties. Our observations show the importance of a protective layer in covering the oxidation-sensitive dilute magnetic semiconductor nanowires. | ||
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URL | http://pubs.acs.org/journal/cgdefu | ||
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