Magnetic precession modes with enhanced frequency and intensity in hard/NM/soft perpendicular magnetic films

Abstract

Magnetic precession with enhanced frequency and amplitude is achieved by controlling tCu and N in perpendicular [Pd/Co]5/Cu(tCu)/[Co/Ni]N films.

Temperature-Dependent Magnetization Dynamics in Nanoscale Cu(tCu)/[Co/Ni]N Perpendicular Multilayers: Implications for Spintronic Applications

“…Our previous results confirm that the surface roughness of Cu under the layer increases with t Cu , and therefore, a thicker Cu produces a larger MDL thickness at the Cu/Co interface Figure a shows the IP and OP magnetic hysteresis loops for these samples, the PMA strength is found to increase gradually with the increase in t Cu because of the enhanced (111) texture Figure b,c shows the typical TR-MOKE data points for the samples of Cu(2)/[Co/Ni] 5 and Cu(8)/[Co/Ni] 5 measured at different T under H = 12 kOe, respectively.…”

“…32 Figure 3a shows the IP and OP magnetic hysteresis loops for these samples, the PMA strength is found to increase gradually with the increase in t Cu because of the enhanced (111) texture. 43 respectively. The T dependences of H keff and α 0 are summarized in Figure 3d.…”

“…Figure b shows the f values measured at different H , which apparently vary with T . In order to clarify the underlying mechanism, the f – H curves are fitted using the following Kittel formula of the uniform precession mode with H 1 = H cos­(θ H – θ) + H Keff cos 2θ and H 2 = H cos­(θ H – θ) + H Keff cos 2 θ, where the magnetization equilibrium angle θ can be determined by 2 H sin­(θ – θ H ) = H keff sin 2θ. From the fitted effective PMA field H keff , we can further obtain the uniaxial PMA constant K u …”

Ferromagnetic resonance modes of a synthetic antiferromagnet at low magnetic fields

“…where H ex = |J IEC |/(tM s ) is the RKKY coupling field strength and J IEC is the coupling constant, with J IEC > 0 for ferromagnetic coupling while J IEC < 0 for antiferromagnetic coupling [33,34]. Recently, the OM resonance has been intensely studied by several groups due to its great potential applications in the high frequency spintronic devices [35][36][37].…”

Magnetic anisotropy manipulation and interfacial coupling in Sm3Fe5O12 films and CoFe/Sm3Fe5O12 heterostructures*

“…During the spintronic device working, the spin manipulation of heterojunction is achieved through external stimuli, such as magnetic field, [12] electric field, [13,14] and laser illumination. [15,16] However, it should be emphasized that the basis for effective external field manipulation is to understand the detailed coupling between magnetic layers in the heterojunction. Therefore, the interfacial spin controlling, such as the films' magnetic anisotropy effect on the interface, is the basis for the application of magnetic heterojunction devices.…”