Coherent and incoherent spin torque oscillations in a nanopillar magnetic spin-valve

2013 ◽  
Vol 102 (25) ◽  
pp. 252402 ◽  
Author(s):  
P. M. Braganca ◽  
O. J. Lee ◽  
O. Ozatay ◽  
L. Liu ◽  
G. Finocchio ◽  
...  
Keyword(s):  
Spin Valve ◽  
Spin Torque ◽  
Magnetic Spin

Enhancing Frequency and Reducing the Power of Spin-Torque Nanooscillator By The Generated Oersted Field

SPIN ◽  
2020 ◽  
Vol 10 (02) ◽  
pp. 2050012
Author(s):  
H. Bhoomeeswaran ◽  
P. Sabareesan
Keyword(s):  
Spin Valve ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Torque ◽  
Spintronic Devices ◽  
Frequency Tunability ◽  
Spin Polarized ◽  
The Individual ◽  
Promising Source ◽  
Nonmagnetic Spacer

The current-driven magnetization precession dynamics stimulated by Spin-Transfer Torque (STT) in a trilayer spin-valve device (typically Spin-Torque Nanooscillator (STNO)) is numerically investigated by solving the Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation. We have devised four STNO devices made of ferromagnetic alloys such as CoPt, CoFeB, Fe[Formula: see text]B[Formula: see text]Ni2 and EuO, which act as free and fixed layers. Here, copper acts as a nonmagnetic spacer for all the devices. In this work, we have introduced the current-induced Oersted field, which is generated when a spin-polarized current passes through the device. The generated Oersted field strength is varied by increasing the diameter of the STNO device. Frequency tunability is achieved in all the four devices, whereas the power of the individual device reduces. The frequency and power of the devices depend entirely on the saturation magnetization of the material, which inherently reflects in the current density and the coherence of the spin-polarized DC. In all devices, the frequency increases, whereas the power decreases by increasing the strength of the Oersted field. Among the four devices, the maximum frequency can be tuned up to 104[Formula: see text]GHz with 40[Formula: see text]nm device diameter, which is obtained for EuO material. This opens a promising source and paves a glittering future for the nanoscale spintronic devices.

Magnetic Spin Valve Sensors with Different Geometry to Magnetic Bead Detection for Biosensor Application

2007 ◽  
Vol 1032 ◽  
Author(s):  
Jeong Dae Suh ◽  
Myung Ae Chung
Keyword(s):  
Magnetic Beads ◽  
Spin Valve ◽  
Magnetic Bead ◽  
Highly Sensitive ◽  
Magnetic Spin ◽  
Biosensor Application ◽  
Detection Of Biomolecules ◽  
Meander Line ◽  
Cross Type ◽  
Line Type

AbstractWe have demonstrated the use of highly sensitive spin valve sensors for the detection of micron magnetic beads. By using a ring type, cross type, and meander line type sensors, we were able to detect the presence of 2.8 μm size magnetic beads in real time by direct measurement of magnetic dipole fields from magnetic beads. The sensitivity of the ring, cross and meander line sensors were obtained about 50 μV/Oe, 7 μV/Oe, 30 μV/Oe and sensor output signals of 50 μV , 30 μV, 90 μV were obtained in an external applied field of 10 Oe and 1 mA sense current. Our results shows that ring, cross, and meander line shape spin valve sensors are very promising candidates for the detection of biomolecules with magnetic labels.

scholarly journals Vortex Induced by DC Current in a Circular Magnetic Spin Valve Nanopillar

2012 ◽  
Vol 48 (4) ◽  
pp. 1297-1300 ◽  
Author(s):  
L. J. Chang ◽  
Pang Lin ◽  
Shang Fan Lee
Keyword(s):  
Spin Valve ◽  
Magnetic Spin ◽  
Dc Current

Modeling of spin-torque driven magnetization dynamics in a spin-valve with combined in-plane and out-of-plane polarizers

2011 ◽  
Vol 99 (22) ◽  
pp. 222509 ◽  
Author(s):  
Zhiwei Hou ◽  
Zongzhi Zhang ◽  
Jianwei Zhang ◽  
Yaowen Liu
Keyword(s):  
Spin Valve ◽  
Spin Torque ◽  
Magnetization Dynamics ◽  
Out Of Plane

Dynamics of spin torque switching in all-perpendicular spin valve nanopillars

2014 ◽  
Vol 358-359 ◽  
pp. 233-258 ◽  
Author(s):  
H. Liu ◽  
D. Bedau ◽  
J.Z. Sun ◽  
S. Mangin ◽  
E.E. Fullerton ◽  
...  
Keyword(s):  
Spin Valve ◽  
Spin Torque

scholarly journals Enhancement in spin-torque efficiency by nonuniform spin current generated within a tapered nanopillar spin valve

2008 ◽  
Vol 77 (14) ◽  
Author(s):  
P. M. Braganca ◽  
O. Ozatay ◽  
A. G. F. Garcia ◽  
O. J. Lee ◽  
D. C. Ralph ◽  
...  
Keyword(s):  
Spin Valve ◽  
Spin Current ◽  
Spin Torque

High frequency spin torque oscillators with composite free layer spin valve

2016 ◽  
Vol 410 ◽  
pp. 210-217 ◽  
Author(s):  
Kanimozhi Natarajan ◽  
Brinda Arumugam ◽  
Amuda Rajamani
Keyword(s):  
High Frequency ◽  
Spin Valve ◽  
Spin Torque ◽  
Free Layer ◽  
Spin Torque Oscillators
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