For diluted magnetic semiconductors (dms), we found that the £1 and £1 + 11 band gap energies increase with x for zn1_xfexse and zn1_xcoxse, and decrease with x for zn1_xmnxse a sp-d direct exchange interaction model which explained the r-point band gap energy of zn1_xmnxse was applied. On the other hand, zno-based diluted magnetic semiconductors (dmss), which involve charge and spin degrees of freedom in a single substance, are attracting much more attention because of the prospect of their application in the emerging field of spintronics, and there has been a major effort to produce dmss with curie temperatures (tc) at or. Diluted magnetic semiconductor resonant tunneling structures for spin manipulation a thesis submitted for the degree of doctor of philosophy bavarian julius-maximilians-universitat. The main objective of this thesis was to explore the structural, electrical, mag- netic and optical properties of titanium based novel oxide thin ﬂlms, such as trans- parent conducting oxides (tcos) and diluted magnetic semiconductors (dmss), so.
Diluted magnetic semiconductor nanomaterials fabrication by a chemical vapor deposition method a thesis submitted to the graduate faculty of the. The aim of the research project presented in this thesis is to investigate the effects of electrostatic gating on the magnetic properties of carrier-mediated ferromagnetic ga1−xmnxas diluted magnetic semiconductors. Studies on diluted oxide magnetic semiconductors for spin electronic applications a thesis submitted in fulfilment of the requirements for the award of the degree.
Compared with the traditional rkky magnetism in diluted magnetic semiconductors which needs undesired free carriers to mediate the magnetism, such magnetism has an carrier-free origin and solves the dark current issue for spintronics applications, such as quantum anomalous hall effect. The paper is organizeddiluted magnetic semiconductor quantum structures this thesis work aims at a better understanding of magneto- optical properties of dilute nitridesin this thesis, several aspects of self-assembled ingaas quantum dots with regard to. Semimagnetic semiconductors, known also as diluted magnetic semiconductors (dms), have been present in the landscape of semiconductor physics since late seventies. A three-day symposium on diluted magnetic (semimagnetic) semiconductors was held as part of the fall meeting of the materials research society in boston, ma, december 1-3, 1986.
The correlation between magnetic properties and electronic structures has been investigated in detail for diluted magnetic semiconductors (dms), which have promising application for spintronics devices. Transition metal-doped sb2te3 and bi2te3 diluted magnetic semiconductors by yi-jiunn chien a dissertation submitted in partial fulfillment of the requirements for the degree of. Semiconductor physics and magnetism are two diverse fields in the domain of physics a significant amount of research and subsequent progress has been made in these fields the advancement made in the understanding the underlying physics has enabled the development of several interesting. Mn-doped ge diluted magnetic semiconductor (dms) [7,9,10] studies concluded that ge(mn) dms could be fabricated with a mn concentration up to 6% [7,9,10], and the curie temperature.
Electrical and magnetic properties of ii-vi diluted magnetic semiconductors horsfall, alton barrett (1997) electrical and magnetic properties of ii-vi diluted magnetic semiconductors doctoral thesis, durham university. 20th international conference on electronic properties of two-dimensional systems (ep2ds-20) and 16th international conference on modulated semiconductor str. Materials research society symposium proceedings volume 89 diluted magnetic (semimagnetic) semiconductors december 1-6, 1986 boston, massachusetts, usa printed from e-media with permission by. Namely, diluted magnetic semiconductors have large spin-dependent properties that can be amplified in the presence of a magnetic field, thereby having the potential of achieving the external control of spin, which is the final goal of spintronics.
Transition metal-doped tetradymite-type semiconductors represent a new class of diluted magnetic semiconductors that are octahedrally coordinated and that possess highly anisotropic structural and magnetic properties. Another part of this thesis consists of magneto -optical studies of diluted magnetic semiconductor (dms) systems the dms system exhibits extraordinarily large spin splittings of the band edges arising from the strong exchange interactions between band carriers and the localized magnetic moments, as examined in cdfese and znfese materials. Majid nili (shared with juana moreno), 20-2010, thesis: ferromagnetism and transport in diluted magnetic semiconductors, postdoc at penn state herbert fotso 2005-2011, thesis: two-particle level diagrammatic approaches for strongly correlated systems , assistant professor.
Diluted magnetic semiconductors (dms's) are semiconductors doped with magnetic ions (3 d transition metals or 4 f lanthanides) dilutely and are ex- pected to have both the properties of magnetic materials and semiconductors. The dilute magnetic semiconductors have two types of lattice structure hexagonal wurtzite and cubic zinc blende wurtzite is the more common and stable form for ii-vi. Imparting magnetic properties into semiconductors, ie through the diluted magnetic semiconductor (dms) route, is an imperative component of spintronics studies for successful spintronic applications, 2 criteria must.