scholarly journals Tuning the perpendicular magnetic anisotropy, spin Hall switching current density, and domain wall velocity by submonolayer insertion in Ta/CoFeB/MgO heterostructures

2017 ◽  
Vol 111 (4) ◽  
pp. 042407 ◽  
Author(s):  
S. P. Bommanaboyena ◽  
M. Meinert
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Current Density ◽  
Perpendicular Magnetic Anisotropy ◽  
Wall Velocity ◽  
Switching Current ◽  
Domain Wall Velocity

scholarly journals Domain Wall Motion Induced by Low Current Density in TbFeCo Wire with Perpendicular Magnetic Anisotropy

2010 ◽  
Vol 34 (3) ◽  
pp. 333-336 ◽  
Author(s):  
Songtian Li ◽  
Hajime Nakamura ◽  
Taichi Kanazawa ◽  
Xiaoxi Liu ◽  
Akimistu Morisako
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Current Density ◽  
Wall Motion ◽  
Perpendicular Magnetic Anisotropy ◽  
Domain Wall Motion

scholarly journals Critical switching current density of magnetic tunnel junction with shape perpendicular magnetic anisotropy through the combination of spin-transfer and spin-orbit torques

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Doo Hyung Kang ◽  
Mincheol Shin
Keyword(s):  
Magnetic Anisotropy ◽  
Current Density ◽  
Perpendicular Magnetic Anisotropy ◽  
Magnetic Tunnel Junction ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Orbit ◽  
Switching Current ◽  
20 Nm ◽  
Hybrid Switching

AbstractRecently, magnetic tunnel junctions (MTJs) with shape perpendicular magnetic anisotropy (S-PMA) have been studied extensively because they ensure high thermal stability at junctions smaller than 20 nm. Furthermore, spin-transfer torque (STT) and spin-orbit torque (SOT) hybrid switching, which guarantees fast magnetization switching and deterministic switching, has recently been achieved in experiments. In this study, the critical switching current density of the MTJ with S-PMA through the interplay of STT and SOT was investigated using theoretical and numerical methods. As the current density inducing SOT ($$J_{\text {SOT}}$$ J SOT ) increases, the critical switching current density inducing STT ($$J_{\text {STT,c}}$$ J STT,c ) decreases. Furthermore, for a given $$J_{\text {SOT}}$$ J SOT , $$J_{\text {STT,c}}$$ J STT,c increases with increasing thickness, whereas $$J_{\text {STT,c}}$$ J STT,c decreases as the diameter increases. Moreover, $$J_{\text {STT,c}}$$ J STT,c in the plane of thickness and spin-orbit field-like torque ($$\beta$$ β ) was investigated for a fixed $$J_{\text {SOT}}$$ J SOT and diameter. Although $$J_{\text {STT,c}}$$ J STT,c decreases with increasing $$\beta$$ β , $$J_{\text {STT,c}}$$ J STT,c slowly increases with increasing thickness and increasing $$\beta$$ β . The power consumption was investigated as a function of thickness and diameter at the critical switching current density. Experimental confirmation of these results using existing experimental techniques is anticipated.

Dzyaloshinskii–Moriya interaction determined from spin wave nonreciprocity and magnetic bubble asymmetry in Pt/Co/Ir/Co/Pt synthetic ferrimagnets

2021 ◽  
Author(s):  
Oksana Koplak ◽  
Alexander Bezverkhnii ◽  
Alexandr Sadovnikov ◽  
Roman Morgunov ◽  
Michel Hehn ◽  
...  
Keyword(s):  
Domain Wall ◽  
Spin Wave ◽  
Perpendicular Magnetic Anisotropy ◽  
Wave Dispersion ◽  
Interlayer Exchange Coupling ◽  
Wall Velocity ◽  
Domain Wall Velocity ◽  
Interlayer Exchange ◽  
Moriya Interaction ◽  
Light Scattering Technique

Abstract We present analysis of the effect of Dzyaloshinskii–Moriya interaction (DMI) on spin wave nonreciprocity and bubble expansion asymmetry in Pt/Co/Ir/Co/Pt synthetic ferrimagnets with perpendicular magnetic anisotropy. We propose analysis of the DMI by Brillouin Light Scattering technique (BLS) and Kerr microscopy (MOKE) in the presence of interlayer exchange coupling strongly changing spin wave dispersion law and field dependences of domain wall velocity in comparison with those observed earlier in Ir/Co/Pt structures with a single Co layer. We have determined DMI values of each Co layer from unusually inverted dependence of velocity of the domain wall on in-plane magnetic field. Opposite signs of effective fields and DMI fields in the two Co layers invert field dependence of the domain wall velocity. DMI energy determined from BLS is higher than values, determined by bubble expansion.

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