Magnetization dynamics for L1 MnGa/Fe exchange coupled bilayers

Abstract

The precessional magnetization dynamics of L10 MnGa/Fe bilayers with a large perpendicular magnetic anisotropy are investigated using vector network analyzer ferromagnetic resonance (VNA-FMR) and time-resolved magneto-optical Kerr effect (TRMOKE). The MnGa/Fe(1 nm) bilayer exhibited perpendicular magnetization and MnGa/Fe(2 and 5 nm) bilayers showed in-plane magnetizations. The VNA-FMR and TRMOKE data for these bilayers are well explained from calculations, based on the coupled Landau-Lifshitz equations, taking into account the interfacial exchange coupling of 2.4 erg/cm2.

Investigation of exchange coupled bilayer Fe/CuMnAs by pump–probe experiment

“…Such a difference between ”dynamic” (i.e., deduced from a pump–probe experiment) and ”static” (e.g., deduced from a SQUID data) anisotropy fields was reported also for other FM/AF bilayer systems . To sum up, from the experimental point‐of‐view, our measurements show that the precession phase, which was only rarely used so far , is an extremely sensitive tool for a research of the exchange coupled bilayers . Moreover, our results imply that averaging of data measured for two opposite field directions, which is sometimes used to remove the non‐magnetic signals , should be applied only with caution in the magnetic bilayers.…”

“…FM/AF bilayers are often studied by static measurements of magnetic hysteresis loops [3][4][5][6]. However, dynamical experiments, like the pump and probe technique, can provide a markedly distinct information about the FM/AF [4][5][6][7][8][9][10][11][12][13][14], FM/FM [15][16][17][18][19][20] or ferrimagnet/ferrimagnet [21] bilayer properties.…”

Perpendicularly Magnetized MnxGa‐Based Magnetic Tunnel Junctions: Materials, Mechanisms, Performances, and Potential Applications

“…It has been theoretically predicted and experimentally verified that the Larmor precession frequency f of Mn x Ga films may reach several hundreds of GHz due to its giant $$H_{\rm{k}}^{{\rm{eff}}}$$. [ 48,146–148 ] From this point of view, Tsunegi et al studied the magnetization dynamics and STD effect in the perpendicularly magnetized L 1 0 ‐Mn 1.5 Ga/FeB‐based orthogonal MTJ in 2018. [ 149 ] The MTJ stacking structure of CoGa(30)/Mn 61 Ga 39 (2)/Fe 90 B 10 (0.4)/Fe(0.4)/Mg(0.4)/MgO(1)/Co 20 Fe 60 B 20 (10)/Ta(3)/Ru(5) (thickness in nm) was grown on Cr‐buffered MgO (001) substrate.…”

Interfacial magnetic coupling and orbital hybridization for D022-Mn3Ga/Fe films

“…The Co and Fe elements are two typical of FM materials investigated in both fundamental science and electronic devices. So the interface interaction for L 10 -MnGa/Co(Fe) films has been extensively studied [14,16,23,36]. In contrast, it is still lack of the study for interfacial magnetic coupling in D0 22 -Mn 3 Ga and Fe bilayer films in theory.…”