scholarly journals Resonant spin-transfer-driven switching of magnetic devices assisted by microwave current pulses

2008 ◽  
Vol 77 (21) ◽  
Author(s):  
Y.-T. Cui ◽  
J. C. Sankey ◽  
C. Wang ◽  
K. V. Thadani ◽  
Z.-P. Li ◽  
...  
Keyword(s):  
Spin Transfer ◽  
Magnetic Devices ◽  
Current Pulses

Magnetization switching by magnon-mediated spin torque through an antiferromagnetic insulator

Science ◽  
2019 ◽  
Vol 366 (6469) ◽  
pp. 1125-1128 ◽  
Author(s):  
Yi Wang ◽  
Dapeng Zhu ◽  
Yumeng Yang ◽  
Kyusup Lee ◽  
Rahul Mishra ◽  
...  
Keyword(s):  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Torque ◽  
Local Magnetization ◽  
Magnetization Switching ◽  
Spintronic Devices ◽  
Magnetic Devices ◽  
Alternative Approach ◽  
Efficient Control ◽  
Electrical Spin

Widespread applications of magnetic devices require an efficient means to manipulate the local magnetization. One mechanism is the electrical spin-transfer torque associated with electron-mediated spin currents; however, this suffers from substantial energy dissipation caused by Joule heating. We experimentally demonstrated an alternative approach based on magnon currents and achieved magnon-torque–induced magnetization switching in Bi2Se3/antiferromagnetic insulator NiO/ferromagnet devices at room temperature. The magnon currents carry spin angular momentum efficiently without involving moving electrons through a 25-nanometer-thick NiO layer. The magnon torque is sufficient to control the magnetization, which is comparable with previously observed electrical spin torque ratios. This research, which is relevant to the energy-efficient control of spintronic devices, will invigorate magnon-based memory and logic devices.

scholarly journals Spin-transfer torque in nanoscale magnetic devices

2011 ◽  
Vol 369 (1951) ◽  
pp. 3617-3630 ◽  
Author(s):  
D. C. Ralph ◽  
Y.-T. Cui ◽  
L. Q. Liu ◽  
T. Moriyama ◽  
C. Wang ◽  
...  
Keyword(s):  
New York ◽  
Magnetic Moments ◽  
Critical Currents ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Torque ◽  
Single Shot ◽  
Cornell University ◽  
Magnetic Devices ◽  
Magnetic Switching

We discuss recent highlights from research at Cornell University, Ithaca, New York, regarding the use of spin-transfer torques to control magnetic moments in nanoscale ferromagnetic devices. We highlight progress on reducing the critical currents necessary to produce spin-torque-driven magnetic switching, quantitative measurements of the magnitude and direction of the spin torque in magnetic tunnel junctions, and single-shot measurements of the magnetic dynamics generated during thermally assisted spin-torque switching.

scholarly journals Characterization of spin-transfer-torque effect induced magnetization dynamics driven by short current pulses

2018 ◽  
Vol 112 (2) ◽  
pp. 022401 ◽  
Author(s):  
T. Meyer ◽  
T. Brächer ◽  
F. Heussner ◽  
A. A. Serga ◽  
H. Naganuma ◽  
...  
Keyword(s):  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Magnetization Dynamics ◽  
Current Pulses

Planar Spin-Transfer Device with a Dynamic Polarizer

2008 ◽  
Vol 8 (6) ◽  
pp. 2891-2896 ◽  
Author(s):  
Ya. B. Bazaliy ◽  
D. Olaosebikan ◽  
B. A. Jones
Keyword(s):  
Thin Film ◽  
Magnetic Anisotropy ◽  
Shape Anisotropy ◽  
Easy Plane ◽  
Spin Transfer ◽  
Size Difference ◽  
Magnetization Direction ◽  
Gilbert Damping ◽  
Magnetic Devices ◽  
Transfer Device

In planar nano-magnetic devices magnetization direction is kept close to a given plane by the large easy-plane magnetic anisotropy, for example by the shape anisotropy in a thin film. In this case magnetization shows effectively in-plane dynamics with only one angle required for its description. Moreover, the motion can become overdamped even for small values of Gilbert damping. We derive the equations of effective in-plane dynamics in the presence of spin-transfer torques. The simplifications achieved in the overdamped regime allow to study systems with several dynamic magnetic pieces ("free layers"). A transition from a spin-transfer device with a static polarizer to a device with two equivalent magnets is observed. When the size difference between the magnets is less than critical, the device does not exhibit switching, but goes directly into the "windmill" precession state.

Micromagnetic simulation of spin transfer torque switching by nanosecond current pulses

2006 ◽  
Vol 99 (8) ◽  
pp. 08B907 ◽  
Author(s):  
Dmytro Apalkov ◽  
Mahendra Pakala ◽  
Yiming Huai
Keyword(s):  
Spin Transfer Torque ◽  
Micromagnetic Simulation ◽  
Spin Transfer ◽  
Current Pulses

Corrosion of Electronic and Magnetic Devices and Materials

1996 ◽  
Vol 451 ◽  
Author(s):  
Gerald S. Frankel
Keyword(s):  
Thin Film ◽  
Failure Modes ◽  
Galvanic Corrosion ◽  
Potential Drop ◽  
Magnetic Devices ◽  
Disk Structure ◽  
Magnetic Layers ◽  
Ohmic Potential Drop ◽  
Corrosion Problem ◽  
Corrosion Susceptibility

ABSTRACTCorrosion of thin film structures commonly used in electronic and magnetic devices is discussed. Typical failure modes are presented, and galvanic corrosion is discussed in some detail since it is one common problem with such devices. A graphical explanation for the determination of the ohmic potential drop during galvanic corrosion is presented. The corrosion problem of thin film disks is shown to have changed during the past ten years owing to changes in disk structure. The corrosion susceptibility of two antiferromagnetic alloys used for exchange coupling to soft magnetic layers is discussed.

3-D optimal design of laminated yoke of billet heater for rolling wire rod using ON/OFF method

2012 ◽  
Vol 61 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Norio Takahashi ◽  
Shunsuke Nakazaki ◽  
Daisuke Miyagi ◽  
Naoki Uchida ◽  
Keiji Kawanaka ◽  
...  
Keyword(s):  
Optimal Design ◽  
Local Heating ◽  
Optimization Method ◽  
Optimal Topology ◽  
Field Problem ◽  
Heating Efficiency ◽  
Magnetic Devices ◽  
Wire Rod ◽  
Magnetic Recording Heads ◽  
Sensitivity Method

3-D optimal design of laminated yoke of billet heater for rolling wire rod using ON/OFF method The optimization method using the ON/OFF sensitivity analysis has an advantage that an epoch-making construction of magnetic circuit may be obtained. Therefore, it is attractive for designers of magnetic devices. We have already developed the ON/OFF method for the optimization of a static magnetic field problem, and the effectiveness is verified by applying it to the optimization of magnetic recording heads. In this paper, the ON/OFF sensitivity method is extended to the optimization of the eddy current problem using the adjoint variable. The newly developed ON/OFF method is applied to the determination of the optimal topology of the yoke of the billet heater for rolling wire rod. As a result, the optimal shape of yoke, which we could not imagine beforehand can be obtained. It is shown that the local heating of the yoke was reduced without decreasing the heating efficiency.

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