%0 Journal Article %1 WOS:000288486700009 %A Leite, R V %A Hidalgo, A A %A Jr., J Milton Pereira %A Filho, R N Costa %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 2011 %I ELSEVIER SCIENCE BV %J JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS %K Green's Impurity Spin ferromagnet; function; mode} wave; {Heisenberg %N 13 %P 1787-1792 %R 10.1016/j.jmmm.2011.02.005 %T Localized magnetic excitations of coupled impurities in a Heisenberg ferromagnet: Optical defect modes %V 323 %X A Green's function method is used to obtain the spectrum of excitations of two neighboring impurities in a semi-infinite ferromagnet. The equations of motion for Green's functions are determined in the framework of the Heisenberg model. The energies of non-resonant localized modes are calculated as a function of the interaction parameters for the exchange coupling between impurity-spin pairs, host-spin pairs, and impurity-host neighbors, as well as the effective field parameter at the impurity sites. With two impurities the system is less symmetric and has more localized modes when compared with a single impurity case. (C) 2011 Elsevier B.V. All rights reserved.

@article{WOS:000288486700009, abstract = {A Green's function method is used to obtain the spectrum of excitations of two neighboring impurities in a semi-infinite ferromagnet. The equations of motion for Green's functions are determined in the framework of the Heisenberg model. The energies of non-resonant localized modes are calculated as a function of the interaction parameters for the exchange coupling between impurity-spin pairs, host-spin pairs, and impurity-host neighbors, as well as the effective field parameter at the impurity sites. With two impurities the system is less symmetric and has more localized modes when compared with a single impurity case. (C) 2011 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {Leite, R V and Hidalgo, A A and Jr., J Milton Pereira and Filho, R N Costa}, biburl = {https://www.bibsonomy.org/bibtex/2d94684f188bd64b360610f55417f5f22/ppgfis_ufc_br}, doi = {10.1016/j.jmmm.2011.02.005}, interhash = {ab4b79558cd11137aabcfebbca0b939e}, intrahash = {d94684f188bd64b360610f55417f5f22}, issn = {0304-8853}, journal = {JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS}, keywords = {Green's Impurity Spin ferromagnet; function; mode} wave; {Heisenberg}, number = 13, pages = {1787-1792}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Localized magnetic excitations of coupled impurities in a Heisenberg ferromagnet: Optical defect modes}, tppubtype = {article}, volume = 323, year = 2011 }