Exchange spring magnets, consisting of a [Co(0.5 nm)/Pd(1 nm)]5 multilayer with perpendicular magnetic anisotropy and a Co20Fe60B20 film with easy plane anisotropy, of variable thickness tCFB, are investigated using Brillouin light scattering. On reducing tCFB in the range 0.8–2.3 nm, the spin-wave frequency gap displays a remarkable increase from nearly 4–48 GHz, reflecting the corresponding rapid growth of the tilting angle of the magnetization with respect to the film normal. These findings are interpreted using a one-dimensional model in which each atomic layer is assumed to be uniformly magnetized, subjected to an effective out-of-plane or easy-plane anisotropy depending on the layer position in the stack, and exchange coupled to its two nearest neighbour atomic layers. With respect to previously investigated [Co/Pd]-NiFe hybrid magnets, a largest frequency tunability, restricted to a narrower range of the soft layer thickness, is observed.
[Co/Pd]-CoFeB exchange spring magnets with tunable gap of spin wave excitations / S Tacchi; T N Anh Nguyen; G Gubbiotti; M Madami; G. Carlotti; M G Pini; A Rettori; V Fallahi; R K Dumas; Johan Åkerman. - In: JOURNAL OF PHYSICS D. APPLIED PHYSICS. - ISSN 0022-3727. - STAMPA. - 47:(2014), pp. 495004-1-495004-6. [10.1088/0022-3727/47/49/495004]
[Co/Pd]-CoFeB exchange spring magnets with tunable gap of spin wave excitations
GUBBIOTTI, GIULIA;A Rettori;
2014
Abstract
Exchange spring magnets, consisting of a [Co(0.5 nm)/Pd(1 nm)]5 multilayer with perpendicular magnetic anisotropy and a Co20Fe60B20 film with easy plane anisotropy, of variable thickness tCFB, are investigated using Brillouin light scattering. On reducing tCFB in the range 0.8–2.3 nm, the spin-wave frequency gap displays a remarkable increase from nearly 4–48 GHz, reflecting the corresponding rapid growth of the tilting angle of the magnetization with respect to the film normal. These findings are interpreted using a one-dimensional model in which each atomic layer is assumed to be uniformly magnetized, subjected to an effective out-of-plane or easy-plane anisotropy depending on the layer position in the stack, and exchange coupled to its two nearest neighbour atomic layers. With respect to previously investigated [Co/Pd]-NiFe hybrid magnets, a largest frequency tunability, restricted to a narrower range of the soft layer thickness, is observed.File | Dimensione | Formato | |
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