Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-04-07
Nature Materials 3, 255-262 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages with 5 figures
Scientific paper
10.1038/nmat1103
Magnetic semiconductors are attracting high interest because of their potential use for spintronics, a new technology which merges electronics and manipulation of conduction electron spins. (GaMn)As and (GaMn)N have recently emerged as the most popular materials for this new technology. While Curie temperatures are rising towards room temperature, these materials can only be fabricated in thin film form, are heavily defective, and are not obviously compatible with Si. We show here that it is productive to consider transition metal monosilicides as potential alternatives. In particular, we report the discovery that the bulk metallic magnets derived from doping the narrow gap insulator FeSi with Co share the very high anomalous Hall conductance of (GaMn)As, while displaying Curie temperatures as high as 53 K. Our work opens up a new arena for spintronics, involving a bulk material based only on transition metals and Si, and which we have proven to display a variety of large magnetic field effects on easily measured electrical properties.
Aeppli Gabriel
DiTusa J. F.
Fisk Zach
Manyala Ncholu
Sidis Yvan
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