Crystal09 users manual university of torino, torino. In a simple system pay attention to that word, a ferromagnetic coupling implies that j 0. Therefore, we tried to realize antiferromagnetic characteristics by oxidation of fgt. Study of antiferromagnetic coupling by ferromagnetic resonance fmr article pdf available in journal of magnetism and magnetic materials 17623. Spinorbit coupling in inversionasymmetric magnetic crystals and structures has emerged as a powerful tool to generate complex magnetic textures, interconvert charge and spin under applied current, and control magnetization dynamics. Pdf study of antiferromagnetic coupling by ferromagnetic.
Mechanism and control of antiferromagnetic coupling in fefe3o4. The robust antiferromagnetic coupling is stabilized by a superexchange interaction, driven by the outofplane molecular orbitals responsible. The robust antiferromagnetic coupling is stabilized by a superexchange interaction, driven by the outofplane molecular orbitals responsible of the magnetic ground state and electronically decoupled from the underlying metal via the graphene layer, as confirmed by ab initio theoretical predictions. Pdf we have worked out the ferromagnetic resonance fmr mode characteristics of an antiferromagnetically coupled twolayer film system. Antiferromagnetic coupling in ferromagneticferrimagnetic. Ferromagnetic and antiferromagnetic coupling of spin molecular. Strong antiferromagnetic coupling in doubly n, o oximatobridged dinuclear copperii complexes. Coupling the valley degree of freedom to antiferromagnetic order xiao li a, ting cao a,b, qian niu a,c, junren shi a, and ji feng a,1 ainternational center for quantum materials, peking university, beijing 100871, china.
In this way, it differs from direct exchange in which there is coupling between nearest neighbor cations not involving an intermediary anion. In small external fields such double layers order antiparallel with their magnetization perpendicular to the external field in analogy to the spin. Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet matthias mergenthaler,1,2, junjie liu,1 jennifer j. Antiferromagnetic an overview sciencedirect topics. This is because when the transition metal is oxidized, the antiferromagnetic property is more common by the superexchange effect and the spinorbit coupling soc 22, 23 such as caxo x mn, cr 24, 25 and xo x 3d ferromagnetic elements. It was shown that parallel coupling is stable for junctions without extra fe atoms whereas ap coupling becomes stable when the number of extra fe atoms. Determination of antiferromagnetic coupling constants in. Thompson,3 lapo bogani,1 fernando luis,4 stephen j. Us20060263643a1 us114,746 us474605a us2006263643a1 us 20060263643 a1 us20060263643 a1 us 20060263643a1 us 474605 a us474605 a us 474605a us 2006263643 a1 us2006263643 a1 us 2006263643a1 authority us united states prior art keywords magnetic thin film layer layers antiferromagnetic coupling prior art date 20050519 legal status the legal status is. The emergence of this order is accompanied by magnetoelastic coupling, which drives anisotropic negative t in celebration of tony cheethams 70th birthday. They are widely applied for technological applications, such as giant magnetoresistance gmr using antiferromagnetic coupling at interface of the magnetic thin film multilayer in order to increase areal density from 1.
Giant magnetoresistance in perpendicularly magnetized. It was grown magnetically to dilute single crystals of about 5% k 2 ircl 6 in a diamagnetic k 2 ptcl 6 host lattice. A bilayer stonerwohlfarth model allows us to describe this evolution, as well as the typical angular. From antiferromagnetic to ferromagnetic coupling for v. Band gap characters and ferromagneticantiferromagnetic. Antiferromagnetic coupling in copperiiporphyrin dimers.
Laird1, 1department of materials, university of oxford, oxford ox1. Back1 1institute for experimental and applied physics, university of regensburg, universitaetstrasse 31. Different antiferromagnetic coupling between 5,5 and 10. Co adipate, coc6h8o4, has been found to order near 10 k into a magnetic structure featuring sheets of tetrahedral co cations coupled antiferromagnetically in two dimensions through carboxylate groups. This is a typical transition metal system in which antiferromagnetic coupling is of interest. We report an advanced organic spininterface architecture with magnetic remanence at room temperature, constituted by metal.
Unlimited viewing of the articlechapter pdf and any associated supplements and figures. Currentinduced spinorbit torques mediate the transfer of angular momentum from the lattice to the spin system, leading to. On the other hand, j kl is the exchange coupling energy between the f k and f l layers, where the positive negative j kl corresponds to the energy of ferromagnetic antiferromagnetic coupling. In this paper, the broken symmetry approach within density functional theory dftbs7,8 is used to investigate the anti ferromagnetic properties of the ag i complex and to study the magnetostructural correlations for the ag i. Antiferromagnetic coupling by spin polarized tunneling. For submonolayer coverage the coupling between v and co is clearly of antiferromagnetic type whereas it changes to ferromagnetic coupling in the case of a full v monolayer on co001. The exact determination of what j is for any given system is usually impossible to find exactly. By controlling the thickness of an antiferromagnetic and ferromagnetic layer, interfacial ionic polarization, as well as the transformation between ferromagnetic and magnetic. For semihydrogenated sic, it is ferromagnetic when all hydrogen atoms bond with silicon atoms, while an antiferromagnetic coupling is predicted when all.
Coupling the valley degree of freedom to antiferromagnetic. Antiferromagnetic coupling and enhanced magnetization in allferromagnetic superlattices. Different antiferromagnetic coupling between 5,5 and 10,10linked ironiii corrole dimers. Superexchange, or kramersanderson superexchange, is the strong usually antiferromagnetic coupling between two nexttonearest neighbour cations through a nonmagnetic anion. Interlayer couplings mediated by antiferromagnetic magnons.
Antiferromagnetic coupling between copperiiporphyrins linked by palladiumii or copperii ions was studied by epr and squid measurements. We consider theoretically the impact of rashba spinorbit coupling on spin torque oscillators stos in synthetic ferromagnets and antiferromagnets that have either a. Antiferromagnetic coupling in perpendicularly magnetized cubic and. Another antiferromagnetic example is k 2 ircl 6 dimeric salt where exchange couplings occur through superexchange mechanism detectable by epr. In an insulating ferromagnetfaff trilayer, we explore the magnonmediated interlayer coupling by calculating the magnon thermal energy in the. Overcoming the limits of the interfacial dzyaloshinskii. Hill b a science division, truman state university, kirksville, mo 63501 b department of physics, university of florida, gainesville, fl 32611 abstract electron spin resonance was used to study the spindimer compound.
Pdf antiferromagnetic coupling by spin polarized tunneling. Ferromagnetic and antiferromagnetic coupling of spin. Strong coupling of microwave photons to antiferromagnetic. Antiferromagneticferromagnetic coupling physics forums. The results obtained in the case of a submonolayer coverage are in agreement with recent xray magnetic circular dichroism by huttel et al. Pdf from antiferromagnetic to ferromagnetic coupling for v. Collinear antiferromagnets afs support two degenerate magnon excitations carrying opposite spin polarizations, by which magnons can function as electrons in various spinrelated phenomena.
Slow magnetic relaxation, antiferromagnetic ordering, and. Aip advances 1, 042155 2011 anomalous antiferromagnetic coupling in fesife structures with co dusting r. Conventional electronics are based invariably on the intrinsic degrees of freedom of an electron, namely, its charge and spin. Files available from the acs website may be downloaded for personal use only. Us20060263643a1 laminated magnetic thin films with weak. Fe iii cn 6 chain complex with highly anisotropic fe. Users are not otherwise permitted to reproduce, republish. In terms of the magnetic field, h jkl j kl m k d k, the coupling in psaf is 17.
Slow magnetic relaxation, antiferromagnetic ordering, and metamagnetism in mn ii h 2 dapsc. In the netural molecule, in which the mn atoms are nominally mnii, there are 5 d electrons. We evidence that the relative strength of the interlayer exchange coupling j to the uniaxial anisotropy k controls a transition from an atype antiferromagnetic order to a ferromagneticlike metamagnetic state. Antiferromagnetic coupling between ferromagnetic layers has been observed for the first time in allsemiconductor superlattice structure euspbs001, by. Pdf strong antiferromagnetic coupling in doubly n, o. Antiferromagnetic coupling is an effect that is often important for molecules with high spin multiplicity like this bridged manganese complex. Ubiquitous longrange antiferromagnetic coupling across the. For the palladiumiilinked dimer, the very small antiferromagnetic coupling was estimated by epr measurements j cdseznmnse quantum dot structures d. Chandran karunakaran, murugesan balamurugan, in spin resonance spectroscopy, 2018. Exchange coupling of co and fe on antiferromagnetic nio.
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