Part ii diluted magnetic semiconductors springerlink. By reducing the thickness of ferromagnetic layers in superlattices e. Pdf optical spectroscopy of widegap diluted magnetic semiconductors. Macdonald1 1department ofphysics, indianauniversity, bloomington,in47405 2department ofphysics, national tsinghuauniversity, hsinchu300,taiwan we present a theory of carrierinduced ferromagnetism in diluted magnetic semiconductors iii1. These are based on traditional semiconductors, but are doped with transition metals instead of, or in addition to, electronically active elements. Oxide diluted magnetic semiconductors odms have attracted a great deal of interest in recent years due to the possibility of inducing room temperature ferromagnetism. Diluted magnetic semiconductors dmss have generally low mobility less than a few hundreds cm 2 v. The magnetic behavior of diluted magnetic semiconductors. Structural and magnetic study of a dilute magnetic semiconductor. The study of magnetic character in tio 2 oxide semiconductors is motivated because of recent interesting reports on in 2 o 3, ito, sno 2, in which magnetic doping induced magnetic properties have been illustrated babu and kaleemulla, 2016, babu et al. Oct 14, 2012 i doubt if this is relevant but the words bring it to mind. Dec 25, 2015 magnetic semiconductors exhibit spontaneous magnetic order. Spin injection phased in among their topics are molecularbeam epitaxy, conductivity and chemical trends, optical properties, ellipsometry, theory of inn surfaces, innbased dilute magnetic semiconductors, and nanocolumns. Theoryof diluted magnetic semiconductor ferromagnetism.
Degree college boys, baramulla, jammu and kashmir, india 2department of physics, davv, indore, madhya pradesh, india. Mar 25, 2016 we consider methods for controlling magnetoresistive parameters of magnetic metal superlattices, manganites, and magnetic semiconductors. Diluted magnetic semiconductors dmss are a class of materials that are typically formed by incorporating magnetic ions such as manganese into conventional semiconductors like gallium arsenide. First, a relatively high magnetization must be obtained by introducing the. What you need to know about nonmagnetic semiconductors. Rkky, dilute magnetic semiconductor, monte carlo, size.
Magnetic properties of co based diluted magnetic semiconductors a i schindler et al. The tetragonal bulk unit cell of rutile has the dimensions, a b 4. Dmss are nonmagnetic semiconductors doped with a few percent of. Proceedings of the 42th jaszowiec international school and conference on the physics of semiconductors, wis. In addition to the iiiv semiconductors, some work has been performed on the iivi semiconductors such as zinc oxide 7. Making nonmagnetic semiconductors magnetic the usefulness of semiconductors resides in the ability to dope them with impurities to change their properties, usually to porntype. The most extensively studied materials of this type are the alloys, in which a fraction of the group ii sublattice is replaced at random by mn.
Actually, the concentration of the magnetic impurities is much higher usually 0. Diluted magnetic semiconductors dilute magnetic semiconductors k. Recently theoretical works predict that some semiconductors e. This approach can be followed to introduce magnetic elements into non magnetic semiconductors to make them magnetic. The contents of the znobased diluted magnetic semiconductors page were merged into magnetic semiconductor on 26th july 2016. Dilute magnetic semiconductor free download as powerpoint presentation. Even ferromagnetism, important for spin polarization, as needed in spinelectronics also called spintronics, can occur below the curie temperature that is characteristic of the material. Magnetic semiconductor layers of a new type nanowerk news researchers at the laboratory of spin and optical electronics of the lobachevsky university nizhny novgorod, russia have obtained a new type of magnetic semiconductor layers, which demonstrate spindependent phenomena in the transport of charge carriers at room temperature journal of applied physics, high. Zno doped with magnetic ions are diluted magnetic semiconductors dms. Dilute magnetic semiconductor ferromagnetism relaxation nmr. Diluted magnetic semiconductors dms are intriguing materials for spintronic applications that offer the possibility of studying magnetic phenomena in crystals with. For the contribution history and old versions of the redirected page, please see. There is a large amount of literature on the introduction of magnetic ions into semiconducting materials 4,5,6, there is some evidence on room temperature ferromagnetism with controllable semiconducting properties 6.
Pdf theory of diluted magnetic semiconductor ferromagnetism. Studies concluded that gemn dms could be fabricated with a mn concentration up to 6% 7,9,10, and the curie temperature. Magnetic semiconductors electronic structure of diluted magnetic semiconductors ferromagnetic semiconductors global electronic structure electronic structure near the chemical potential charge carriers soft xray magnetic circular dichroism studies identification of ferromagnetic component local magnetic susceptibility. Researchers from spain report theoretical phase diagrams of iivi dilute magnetic semiconductors for use as spin injectors. Join researchgate to discover and stay uptodate with the latest research from leading experts in dilute magnetic semiconductors and many other scientific topics. We describe exchange interactions in dilute magnetic semiconductors dms based on ab initio calculations. Dederichs iff, research center j ulich, d52425 j ulich, germany abstract we describe exchange interactions in dilute magnetic semiconductors dms based on. 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. Majority of the studies on magnetic semiconductors conducted today are being done on alloy semiconductors, in which magnetic elements substitute a part of lattice sites of host nonmagnetic materials. To that end, dilute magnetic semiconductors dms have recently been a major focus of magnetic semiconductor research. It was in this context that the concept of diluted magnetic semiconductor dms emerged. Therefore, magnetic order affects strongly the carrier motion and the carriers themselves may exert a strong influence on the magnetic order. This is because the radiative recombination is a first order transition.
Magnetic semiconductors, in which spin and chargedependent properties of electrons coexist, has been attracting attention as the possible nextgeneration spinelectronics materials. Magnetic semiconductors are semiconductor materials that exhibit both ferromagnetism or a similar response and useful semiconductor properties. Magnetic beha vlor of 11vi group diluted magnetic semiconductors, based on fe 1. Roomtemperature ferromagnetism in nidoped tio2 diluted. Diluted magnetic semimagnetic semiconductors december 16, 1986 boston, massachusetts, usa printed from emedia with permission by.
Magnetoresistive properties of nanostructured magnetic metals. Introduction to the physics of diluted magnetic semiconductors. Energy level calculations in diluted magnetic semiconductor core shell quantum dots bashir mohi ud din bhat1 and pratima sen 2 1department of physics, govt. We focus the discussion on the role of the holes in the establishing the ferromagnetic order in various systems. Diluted magnetic semiconductors center for spintronics integrated. If implemented in devices, these materials could provide a new type of control of conduction. Magnetic semiconductors provide control of spin states in addition to charge states realized in conventional semiconductors, yet currently limited to weak magnetism at low temperature. Energy level calculations in diluted magnetic semiconductor. Polymorphism in the ferromagnetic gacrndiluted magnetic.
Pdf we present a theory of carrierinduced ferromagnetism in diluted magnetic semiconductors iii1. For dilute magnetic semiconductors it is very important to distinguish two states, the ferromagnetic one, where all moments of the magnetic atoms are aligned in one direction, or the disorderedlocalmoment dlm state or spinglass state where. Magnetic behavlor of 11vi group diluted magnetic semiconductors, based on mn 1. Znobased nanostructures for diluted magnetic semiconductor. One of the promising classes of materials are diluted magnetic semiconductors. Whereas traditional electronics are based on control of charge carriers nor ptype, practical magnetic semiconductors would also allow control of quantum. The book deals with diluted magnetic semiconductors, a class of materials. Semiconductors with electric and magnetic properties. Oct 17, 2012 european scientists developed solidstate semiconductor components with magnetic properties, a prerequisite for a new generation of electronic devices exploiting both the charge and the spin of. For successful spintronic applications, 2 criteria must be ful lled by the dms materials.
Luminescence properties of the transitionmetal chromiumdoped gallium nitride gacrn epitaxial layers on sapphire substrates have been extensively studied by varying the doping level, excitation intensity, and temperature of study. Institute of experimental physics, warsaw university, hoza 69, 00681 warsaw, poland. Direct band gaps semiconductors indicated by shading are particularly important for electroluminescent devices. Fe doped ceo 2 nanoparticles shalendra kumar1, geun woo kim1, b. Diluted magnetic semiconductor resonant tunneling structures for spin manipulation a thesis submitted for the degree of doctor of philosophy bavarian juliusmaximiliansuniversitat. Dilute magnetic semiconductors how is dilute magnetic. While researching magnetic amplifiers i once wondered if an easily saturated toroid wound with many turns on one winding a and biased by another similar winding b with a steady dc current, would act as a diode when winding a is exposed to ac.
They are of interest in the field of spintronics that seeks to exploit the intrinsic magnetism of electrons in electronic devices. Structural and magnetic study of a dilute magnetic. Using firstprinciples calculations, we propose a twodimensional diluted magnetic semiconductor. Diluted magnetic semiconductors mrs bulletin cambridge. We suggest a method of the quantitative characterization of the properties of the holes. During recent years diluted magnetic semiconductors based on iiiv. Diluted magnetic semiconductors dms are semiconducting alloys whose lattice is partly made of substitutional magnetic ions. A special feature of these magnetic semiconductors is that carriers s electrons interact strongly with the moments of partly filled d or f shells of magnetic ions. In semiconductor devices, the information is transferred by charge. Katayamayoshida isir, osaka university, 5670047 osaka, japan p.
This class of magnetic semiconductor is called diluted magnetic semiconductor dms or semimagnetic semiconductor. Magnetic properties of sn cr te diluted magnetic semiconductors. Introduction dilute magnetic semiconductors dmss are magnetic materials where parts of the host metal are replaced by magnetic ions of rare earth or transition metals. Crystal growth and characterization of magnetic semiconductors. Magnetic semiconductor an overview sciencedirect topics. The electronic structure of dms is calculated on the basis of the density functional. The term dms applies generally to semiconductors in which a fraction of its constituent ions are replaced by magnetic ions. May 09, 2016 ferromagnetism and semiconductor spintronics offer new opportunities for improving electronics. In 1996, ohno rstly used mbe technique to produce ga 1 xmn xas thin lm with a largely enhanced solubility of the order of 1020cm. Theoryof diluted magnetic semiconductor ferromagnetism ju. Diluted magnetic semiconductor resonant tunneling structures. Making nonmagnetic semiconductors ferromagnetic science 281. Photoluminescence spectra of the doped films were found to be dominated by an excitonic peak around 3. Prediction of twodimensional diluted magnetic semiconductors.