LEADER 02880nam 2200421 450 001 9910820016403321 005 20210329145751.0 010 $a3-8325-9205-9 035 $a(CKB)4340000000248753 035 $a(MiAaPQ)EBC5313470 035 $a5c7aad7e-8dd4-4170-8f05-7583b0dd2d03 035 $a(EXLCZ)994340000000248753 100 $a20180521d2017 uy 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aConfined magnon modes and anisotropic exchange interaction in ultrathin Co films /$fvorgelegt von Ying-Jiun Chen 210 1$aBerlin :$cLogos Verlag,$d[2017] 210 4$dİ2017 215 $a1 online resource (128 pages) 300 $aPublicationDate: 20170418 311 $a3-8325-4470-4 330 $aLong description: A fundamental need in wireless communication and modern computer processors is to fabricate faster, smaller, and lower power-consumption circuits. A promising approach is the utilization of spin waves, or rather, magnons in ferromagnetic films. Quantum confinement in ultra-thin films permits the coexistence of several exchange-dominated magnon modes with terahertz-range frequencies and sub-nanometer length scales. By means of spin-polarized electron energy loss spectroscopy (SPEELS), these exchange-dominated terahertz magnons are directly probed in ultra-thin cobalt films on Ir(001), Cu(001) and Pt(111) single crystal surfaces. The dispersion relation of the quantized magnon modes depends particularly on the interatomic exchange interaction in individual layers. By tuning the exchange interaction, modes with opposite group velocities, and thus an opposite propagation direction of the wave packets, can be generated. Ab initio theoretical calculations as well as an analytical Heisenberg model reveal a spatial localization of the modes at the surface, interior, and interface of the film that opens an experimental access to the layer-dependent magnetic properties. In itinerant ferromagnets like cobalt the magnetic properties depend sensitively on many-body correlation effects in the electronic structure. Here, it is shown for the first time that spin-dependent correlations lead to a pronounced renormalization of the energy of the highest magnon mode by up to 260 meV, explaining the significant overestimation of theoretically predicted magnon energies and interatomic exchange interaction found in literature. 606 $aMagnons 606 $aSpin waves 615 0$aMagnons. 615 0$aSpin waves. 676 $a530.41 700 $aChen$b Ying-Jiun$01672816 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910820016403321 996 $aConfined magnon modes and anisotropic exchange interaction in ultrathin Co films$94036414 997 $aUNINA