Perpendicular Magnetic Anisotropy on W-based Spin-Orbit Torque CoFeB | MgO MRAM Stacks

2015 ◽  
Vol 1729 ◽  
pp. 73-78 ◽  
Author(s):  
Andreas Kaidatzis ◽  
Vasileios Psycharis ◽  
José Miguel García-Martín ◽  
Cristina Bran ◽  
Manuel Vázquez ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Layer Thickness ◽  
High Spin ◽  
Perpendicular Magnetic Anisotropy ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Β Phase

ABSTRACTWe study W | Ta | CoFeB | MgO stacks for spin-orbit torque MRAM applications. A strong perpendicular magnetic anisotropy is obtained after annealing for CoFeB layer thickness of 0.9 nm or 1.2 nm and for specific W/Ta ratios, were the Ta layer thickness is between 0.3 nm and 1 nm. Furthermore, the desired high-spin orbit coupling β-phase of W is preserved even after annealing at 350°C. We argue that an efficient B getter, like Ta, is necessary for the coherent crystallization of the CoFeB | MgO interface that allows for the establishment of perpendicular magnetic anisotropy.

scholarly journals Spin–Orbit Effects in CoFeB/MgO Heterostructures with Heavy Metal Underlayers

SPIN ◽  
2016 ◽  
Vol 06 (02) ◽  
pp. 1640002 ◽  
Author(s):  
Jacob Torrejon ◽  
Junyeon Kim ◽  
Jaivardhan Sinha ◽  
Masamitsu Hayashi
Keyword(s):  
Heavy Metal ◽  
Transition Metals ◽  
Magnetic Anisotropy ◽  
Metal Layer ◽  
Perpendicular Magnetic Anisotropy ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Moriya Interaction ◽  
Strong Spin

We study effects originating from the strong spin–orbit coupling in CoFeB/MgO heterostructures with heavy metal (HM) underlayers. The perpendicular magnetic anisotropy at the CoFeB/MgO interface, the spin Hall angle of the heavy metal layer, current induced torques and the Dzyaloshinskii–Moriya interaction at the HM/CoFeB interfaces are studied for films in which the early 5[Formula: see text] transition metals are used as the HM underlayer. We show how the choice of the HM layer influences these intricate spin–orbit effects that emerge within the bulk and at interfaces of the heterostructures.

scholarly journals Spin-orbit coupling induced magnetic anisotropy and large spin wave gap in NaOsO3

2018 ◽  
Vol 2 (11) ◽  
pp. 115016 ◽  
Author(s):  
Avinash Singh ◽  
Shubhajyoti Mohapatra ◽  
Churna Bhandari ◽  
Sashi Satpathy
Keyword(s):  
Magnetic Anisotropy ◽  
Spin Wave ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Induced Magnetic Anisotropy ◽  
Spin Wave Gap ◽  
Large Spin

scholarly journals Back Cover: Probing Proximity‐Tailored High Spin–Orbit Coupling in 2D Materials (Adv. Quantum Technol. 9/2020)

2020 ◽  
Vol 3 (9) ◽  
pp. 2070093
Author(s):  
Krishna Rani Sahoo ◽  
T. Pradeep Chakravarthy ◽  
Rahul Sharma ◽  
Sumit Bawari ◽  
Suman Mundlia ◽  
...  
Keyword(s):  
High Spin ◽  
2D Materials ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Back Cover

scholarly journals Low-field Magnetic Anisotropy of Sr2IrO4

2022 ◽  
Author(s):  
Muhammad Nauman ◽  
Tayyaba Hussain ◽  
Joonyoung Choi ◽  
Nara Lee ◽  
Young Jai Choi ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Exchange Interaction ◽  
Exchange Interactions ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Easy Magnetization ◽  
Magnetic Exchange ◽  
Crystal Field Effect ◽  
Out Of Plane

Abstract Magnetic anisotropy in strontium iridate (Sr2IrO4) is essential because of its strong spin–orbit coupling and crystal field effect. In this paper, we present a detailed mapping of the out-of-plane (OOP) magnetic anisotropy in Sr2IrO4 for different sample orientations using torque magnetometry measurements in the low-magnetic-field region before the isospins are completely ordered. Dominant in-plane anisotropy was identified at low fields, confirming the b axis as an easy magnetization axis. Based on the fitting analysis of the strong uniaxial magnetic anisotropy, we observed that the main anisotropic effect arises from a spin–orbit-coupled magnetic exchange interaction affecting the OOP interaction. The effect of interlayer exchange interaction results in additional anisotropic terms owing to the tilting of the isospins. The results are relevant for understanding OOP magnetic anisotropy and provide a new way to analyze the effects of spin–orbit-coupling and interlayer magnetic exchange interactions. This study provides insight into the understanding of bulk magnetic, magnetotransport, and spintronic behavior on Sr2IrO4 for future studies.

On the magnetic anisotropy and susceptibility of Fe(NH 4 SO 4 ) 2 , 6H 2 O

1961 ◽  
Vol 261 (1305) ◽  
pp. 207-214 ◽  
Keyword(s):  
Thermal Expansion ◽  
Magnetic Anisotropy ◽  
Crystal Lattice ◽  
Crystal Field ◽  
Coupling Coefficient ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Anisotropic Part ◽  
Free Ion

The theory of magnetic anisotropy and susceptibility of Fe 2+ in Tutton salts has been worked out on the basis of Abragam & Pryce’s method. It is found that the anisotropic part of the crystal field changes with temperature owing to the thermal expansion of the crystal lattice. The spin-orbit coupling coefficient has to be decreased by ~ 20 % from its free ion value of - 103 cm -1 which indicates some amount of overlap between the 3 d -Fe 2+ and 8 - and p -O 2- charge clouds. The agreement of the theoretical values with the experiment is good within the limitations of the approximations involved.

scholarly journals Atomic-scale control of magnetic anisotropy via novel spin–orbit coupling effect in La2/3Sr1/3MnO3/SrIrO3 superlattices

2016 ◽  
Vol 113 (23) ◽  
pp. 6397-6402 ◽  
Author(s):  
Di Yi ◽  
Jian Liu ◽  
Shang-Lin Hsu ◽  
Lipeng Zhang ◽  
Yongseong Choi ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Transition Metal Oxides ◽  
Coupling Effect ◽  
Orbit Coupling ◽  
Atomic Scale ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Precise Control ◽  
Magnetic Easy Axis ◽  
Scale Control

Magnetic anisotropy (MA) is one of the most important material properties for modern spintronic devices. Conventional manipulation of the intrinsic MA, i.e., magnetocrystalline anisotropy (MCA), typically depends upon crystal symmetry. Extrinsic control over the MA is usually achieved by introducing shape anisotropy or exchange bias from another magnetically ordered material. Here we demonstrate a pathway to manipulate MA of 3d transition-metal oxides (TMOs) by digitally inserting nonmagnetic 5d TMOs with pronounced spin–orbit coupling (SOC). High-quality superlattices comprising ferromagnetic La2/3Sr1/3MnO3 (LSMO) and paramagnetic SrIrO3 (SIO) are synthesized with the precise control of thickness at the atomic scale. Magnetic easy-axis reorientation is observed by controlling the dimensionality of SIO, mediated through the emergence of a novel spin–orbit state within the nominally paramagnetic SIO.

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