The introduction of oxygen to a cofetab system is performed by magnetron sputtering under a gas mixture of argon and oxygen. Diluted magnetic semimagnetic semiconductors december 16, 1986 boston, massachusetts, usa printed from emedia with permission by. The book deals with diluted magnetic semiconductors, a class of materials important to the emerging field of spintronics. Dms are of interest, from the fundamental as well as from the technological point of view, for three reasons. Diluted magnetic semiconductors an introduction international conference and school on spintronics and quantum information technology spintech vi school lecture 2 diluted magnetic semiconductors matsue, japan, august 1, 2011 hideo ohno 1,2 1center for spintronics integrated systems, tohoku university, sendai, japan. We theoretically study the development of spontaneous magnetization in diluted magnetic semiconductors as arising from a percolation of bound magnetic.
Xray diffraction and transmission electron microscopy analysis show that the films deposited under oxygen partial pressures of 103 and 105 torr are uniform without clusters or secondary phases. Diluted magnetic semiconductors dms form a new class of magnetic materials, which fill the gap between ferromagnets and semiconductors. Novel diluted magnetic semiconductor materials based on zinc. Diluted magnetic semiconductor resonant tunneling structures. Five percent fedoped in2o3 films were deposited using a pulsed laser deposition system. The primary aim of a dms is compatibility with existing semiconductor structures and materials. Diluted magnetic semiconductors dms are compound semiconductors, in which a part of the nonmagnetic cations of the host material has been randomly substituted by magnetic ions. Diluted magnetic semiconductors dms are semiconducting alloys whose lattice is partly made of substitutional magnetic ions. Under the common preparation conditions, excess zinc is always found in zno. Magnetic properties of the diluted magnetic semiconductor znt. Semiconductordms interfaces can be made by introducing the dopant during the growth process, this controllability is especially evident in processes such as. Diluted magnetic semiconductors dms, semiconductors in which a fraction of non magnetic sites have been replaced with their magnetic counterparts, have been in the limelight of the scientific community since the turn of the 21st century. Diluted magnetic semiconductors in the low carrier density regime.
Doping of transition metal atoms from the iiib to vib groups results in nonmagnetic states, since the number of valence electrons is smaller or equal to that of mo. Electrical gating effects on the magnetic properties of. Cyclotron resonance in high magnetic fields 63 2 cyclotron resonance in inmnas as a rstexample to show the power andusefulnessof ultrahigh eldcr, herewe describe a series of recent cr experiments on inmnas lms and heterostructures using the singleturn coil method. An important moment in the field of diluted magnetic semiconductors was the discovery of carriermediated ferromagnetism of mndoped inas and mndoped gaas, the latter with a t c as high as 110 k which in subsequent works has been pushed up to 170 k for a mn concentration of 78%. Magnetic behavlor of 11vi group diluted magnetic semiconductors, based on mn 1. Recent topics in diluted magnetic semiconductors youtube. A perspective of recent progress in zno diluted magnetic semiconductors 243 table 1 experimental studies of spin coherence in zno material type of spin lifetime spin lifetime temperature method note reference year zno bulk single crystal electron spincoherence time. Publishers pdf, also known as version of record includes final. Inmnas is the rstgrown iiiv dilute magnetic semiconductor dms42. The advantage of dms, compared to metals, is that conductivity of the injector is similar to that of the nonmagnetic semiconductor used in applications, and in this way the conductance mismatch problem can be overcome. Dilute magnetic semiconductors dms are semiconductors doped with transition metal atoms.
While many traditional magnetic materials, such as magnetite, are also semiconductors magnetite is a semimetal semiconductor with bandgap 0. A a magnetic semiconductor, in which a periodic array of magnetic element is present. Transition metal doped zno has proved to be a potential candidate as a dms showing rtfm. Electronic spin resonance esr was used to study the magnetic properties of this solution. Theoryof diluted magnetic semiconductor ferromagnetism. Magnetic specific heat of the diluted magnetic semiconductor. Study of diluted magnetic semiconductors infoscience. However, the film deposited under 107 torr has a ferich phase at the interface. We report the densityfunctionaltheory calculations of the exchange interactions and curie temperature for a series of iiiv and iivi diluted magnetic. The low temperature specific heat of the febased diluted magnetic semiconductor hg 1. Diluted magnetic semiconductors dms are basically alloys of iivi or ivvi semiconductor compounds with groupii or groupiv elements replaced by metal ions. In the early literature these dms were often named semimagnetic semiconductors, because they are midway between nonmagnetic and magnetic materials. The magnetic properties of dilute magnetic semiconductors dmss are calculated from firstprinciples by mapping the ab initio results on a classical heisenberg model. Introduction to the physics of diluted magnetic semiconductors.
Theoryof diluted magnetic semiconductor ferromagnetism ju. The term dms applies generally to semiconductors in which a fraction of its constituent ions are replaced by magnetic ions. In a diluted magnetic semiconductor a fraction of the host atoms is substituted by the transition metal dopant ion. Katayamayoshida isir, osaka university, 5670047 osaka, japan p. Wilamowski1 1institute of physics pas, 02668 warsaw, poland 2college of science by the polish academy of sciences, warsaw, poland this paper is an attempt to modify the classic rudermankittelkasuyayosida rkky. The introduction of oxygen to a cofetab system is performed by magnetron sputtering under a. Theory of diluted magnetic semiconductor ferromagnetism. The interest in these materials is spurred from their application in the spin electronics, the developing technology based on the usage of the fundamental. Due to this zinc excess, zno is a nonstoichiometric compound and an ntype semiconductor. Diluted magnetic semiconductors center for spintronics integrated. A special presentation entitled recent topics in diluted magnetic semiconductors by hideo ohno from the tohoku university, sendai, japan. Intrinsic or interface clusteringinduced ferromagnetism in. The rkky coupling in diluted magnetic semiconductors a.
Dmss are nonmagnetic semiconductors doped with a few percent of. These doped materials are known as dilute magnetic semiconductors dmss, where usually a transition element is substituted on a small fraction, x, of a host semiconductor element sites. Diluted magnetic semiconductors dms can serve this role, but they should not only display room temperature ferromagnetism rtfm but also be capable of generating spin polarized carriers. Diluted magnetic semiconductor spintronics abstract deposition of 0. Matsue, japan, august 1, 2011 diluted magnetic semiconductors. Dederichs iff, research center j ulich, d52425 j ulich, germany abstract we describe exchange interactions in dilute magnetic semiconductors dms based on. Actually, the concentration of the magnetic impurities is much higher usually 0. Polaron percolation in diluted magnetic semiconductors. Pdf theory of diluted magnetic semiconductor ferromagnetism. Diluted magnetic semiconductors dmss have generally low mobility less than a few hundreds cm 2 v. The magnetic behavior of diluted magnetic semiconductors.
Density of states of dilute magnetic semiconductors with 5 % mn impurities. Jan 25, 20 a special presentation entitled recent topics in diluted magnetic semiconductors by hideo ohno from the tohoku university, sendai, japan. Electrical gating effects on the magnetic properties of ga. B a diluted magnetic semiconductor, an alloy between nonmagnetic semiconductor and magnetic element. Magnetic beha vlor of 11vi group diluted magnetic semiconductors, based on fe 1. Magnetism and semiconducting properties are known to coexist in some ferromagnetic. What you need to know about nonmagnetic semiconductors. Magnetic correlations in the diluted magnetic semiconductor. The origin of ferromagnetism kaili zhang literature seminar september 18, 2014 a dilute magnetic semiconductor dms is a semiconductor material that has been made ferromagnetic through doping with transition metal cations at low concentrations. Pdf we present a theory of carrierinduced ferromagnetism in diluted magnetic semiconductors iii1.
Diluted magnetic semiconductors mrs bulletin cambridge core. Macdonald1 1department ofphysics, indianauniversity, bloomington,in47405 2department ofphysics, national tsinghuauniversity, hsinchu300,taiwan we present a theory of carrierinduced ferromagnetism in diluted magnetic semiconductors iii1. The full curve gives the average dos of the whole system, the dotted curve the local dos of the mn atoms. Structure and magnetism of transitionmetal implanted dilute. Theory of diluted magnetic semiconductors sciencedirect. The discovery of a dilute magnetic semiconductor dms in which ferro.
745 1055 823 467 459 73 1602 138 1539 736 31 516 225 1590 344 184 746 1134 1281 369 581 1051 948 1234 1130 1098 215 437 382