@article {Tacchi2014b,
	title = {[Co/Pd]-CoFeB exchange spring magnets with tunable gap of spin wave excitations},
	journal = {Journal of physics. D, Applied physics (Online)},
	volume = {47},
	year = {2014},
	note = {This work was supported by MIUR-PRIN 2010-11 Project 2010ECA8P3 \'DyNanoMag\'.},
	pages = {495004-1–495004-6},
	publisher = {IOP Publishing.},
	address = {[Bristol]},
	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.},
	keywords = {Brillouin light scattering, exchange spring magnets, spin waves},
	issn = {1361-6463},
	doi = {10.1088/0022-3727/47/49/495004},
	url = {http://iopscience.iop.org/0022-3727/47/49/495004/pdf/0022-3727_47_49_495004.pdf},
	author = {S Tacchi and T N Anh Nguyen and G Gubbiotti and M Madami and G Carlotti and M G Pini and A Rettori and V Fallahi and R K Dumas and Johan Åkerman}
}
