Angle resolved second harmonic technique for precise evaluation of spin orbit torque in strong perpendicular magnetic anisotropy systems

2021 ◽  
Vol 119 (22) ◽  
pp. 222402
Author(s):  
Takanori Shirokura ◽  
Pham Nam Hai
Keyword(s):  
Magnetic Anisotropy ◽  
Second Harmonic ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Orbit ◽  
Precise Evaluation

scholarly journals Anisotropy and Current Control of Magnetization in SrRuO3/SrTiO3 Heterostructures for Spin-Memristors

2021 ◽  
Vol 3 ◽  
Author(s):  
A. S. Goossens ◽  
M. A. T. Leiviskä ◽  
T. Banerjee
Keyword(s):  
Magnetic Anisotropy ◽  
Second Harmonic ◽  
Perpendicular Magnetic Anisotropy ◽  
Magnetic Tunnel Junction ◽  
Complex Oxide ◽  
Current Control ◽  
High Symmetry ◽  
Spin Orbit ◽  
Tunnel Current ◽  
Neuromorphic Circuits

Spintronics-based nonvolatile components in neuromorphic circuits offer the possibility of realizing novel functionalities at low power. Current-controlled electrical switching of magnetization is actively researched in this context. Complex oxide heterostructures with perpendicular magnetic anisotropy (PMA), consisting of SrRuO3 (SRO) grown on SrTiO3 (STO) are strong material contenders. Utilizing the crystal orientation, magnetic anisotropy in such simple heterostructures can be tuned to either exhibit a perfect or slightly tilted PMA. Here, we investigate current induced magnetization modulation in such tailored ferromagnetic layers with a material with strong spin-orbit coupling (Pt), exploiting the spin Hall effect. We find significant differences in the magnetic anisotropy between the SRO/STO heterostructures, as manifested in the first and second harmonic magnetoresistance measurements. Current-induced magnetization switching can be realized with spin-orbit torques, but for systems with perfect PMA this switching is probabilistic as a result of the high symmetry. Slight tilting of the PMA can break this symmetry and allow the realization of deterministic switching. Control over the magnetic anisotropy of our heterostructures therefore provides control over the manner of switching. Based on our findings, we propose a three-terminal spintronic memristor, with a magnetic tunnel junction design, that shows several resistive states controlled by electric charge. Non-volatile states can be written through SOT by applying an in-plane current, and read out as a tunnel current by applying a small out-of-plane current. Depending on the anisotropy of the SRO layer, the writing mechanism is either deterministic or probabilistic allowing for different functionalities to emerge. We envisage that the probabilistic MTJs could be used as synapses while the deterministic devices can emulate neurons.

Electrical Control of Perpendicular Magnetic Anisotropy and Spin‐Orbit Torque‐Induced Magnetization Switching

2019 ◽  
Vol 6 (3) ◽  
pp. 1900782 ◽  
Author(s):  
Qikun Huang ◽  
Yanan Dong ◽  
Xiaonan Zhao ◽  
Jing Wang ◽  
Yanxue Chen ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Orbit ◽  
Magnetization Switching ◽  
Electrical Control

Giant Enhancements of Perpendicular Magnetic Anisotropy and Spin‐Orbit Torque by a MoS 2 Layer

2019 ◽  
Vol 31 (21) ◽  
pp. 1900776 ◽  
Author(s):  
Qidong Xie ◽  
Weinan Lin ◽  
Baishun Yang ◽  
Xinyu Shu ◽  
Shaohai Chen ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Orbit

scholarly journals Enhanced spin-orbit torques and perpendicular magnetic anisotropy in CoFeB/MgO structures with Ta/W bilayer

AIP Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 065007 ◽  
Author(s):  
S. K. Li ◽  
X. T. Zhao ◽  
W. Liu ◽  
T. T. Wang ◽  
X. G. Zhao ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Orbit

scholarly journals Toggle Spin-Orbit Torque MRAM With Perpendicular Magnetic Anisotropy

2019 ◽  
Vol 5 (2) ◽  
pp. 166-172 ◽  
Author(s):  
Naimul Hassan ◽  
Susana P. Lainez-Garcia ◽  
Felipe Garcia-Sanchez ◽  
Joseph S. Friedman
Keyword(s):  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Orbit
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