scholarly journals Thermally assisted magnetization reversal of a magnetic nanoparticle driven by a down-chirp microwave field pulse

2021 ◽  
Vol 537 ◽  
pp. 168174
Author(s):  
M.T. Islam ◽  
M.A.J. Pikul ◽  
X.S. Wang
Keyword(s):  
Magnetization Reversal ◽  
Magnetic Nanoparticle ◽  
Microwave Field ◽  
Field Pulse

scholarly journals Fast magnetization reversal of a magnetic nanoparticle induced by cosine chirp microwave field pulse

2021 ◽  
Author(s):  
Md. Torikul Islam ◽  
Md. Abdus Sami Akanda ◽  
Md. Abu Jafar Pikul ◽  
Xiansi Wang
Keyword(s):  
Magnetization Reversal ◽  
Magnetic Nanoparticle ◽  
Microwave Pulse ◽  
Microwave Field ◽  
Low Cost ◽  
Memory Device ◽  
Frequency Change ◽  
Initial Frequency ◽  
Plane Shape ◽  
Magnetization Precession

Abstract We investigate the magnetization reversal of single-domain magnetic nanoparticle driven by the circularly polarized cosine chirp microwave pulse (CCMP). The numerical findings, based on the Landau-Lifshitz-Gilbert equation, reveal that the CCMP is by itself capable of driving fast and energy-efficient magnetization reversal. The microwave field amplitude and initial frequency required by a CCMP are much smaller than that of the linear down-chirp microwave pulse. This is achieved as the frequency change of the CCMP closely matches the frequency change of the magnetization precession which leads to an efficient stimulated microwave energy absorption (emission) by (from) the magnetic particle before (after) it crosses over the energy barrier. We further find that the enhancement of easy-plane shape anisotropy significantly reduces the required microwave amplitude and the initial frequency of CCMP. We also find that there is an optimal Gilbert damping for fast magnetization reversal. These findings may provide a pathway to realize the fast and low-cost memory device.

scholarly journals Magnetization Reversal in Exchange Spring Bilayer System Under Circularly Polarized Microwave Field

2014 ◽  
Vol 50 (11) ◽  
pp. 1-4
Author(s):  
Renuka Tayade ◽  
Alexandre Pasko ◽  
Claudio Serpico ◽  
Frederic Mazaleyrat ◽  
Martino LoBue
Keyword(s):  
Magnetization Reversal ◽  
Microwave Field ◽  
Circularly Polarized ◽  
Bilayer System ◽  
Exchange Spring

Picosecond precessional magnetization reversal by magnetic field pulse shaping

2002 ◽  
Vol 38 (5) ◽  
pp. 2484-2488 ◽  
Author(s):  
Th. Gerrits ◽  
H.A.M. van den Berg ◽  
J. Hohlfeld ◽  
O. Gielkens ◽  
K.J. Veenstra ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetization Reversal ◽  
Pulse Shaping ◽  
Magnetic Field Pulse ◽  
Field Pulse

Ultrafast precessional magnetization reversal by picosecond magnetic field pulse shaping

Nature ◽  
2002 ◽  
Vol 418 (6897) ◽  
pp. 509-512 ◽  
Author(s):  
Th. Gerrits ◽  
H. A. M. van den Berg ◽  
J. Hohlfeld ◽  
L. Bär ◽  
Th. Rasing
Keyword(s):  
Magnetic Field ◽  
Magnetization Reversal ◽  
Pulse Shaping ◽  
Magnetic Field Pulse ◽  
Field Pulse

Magnetization reversal of a single cobalt cluster using a RF field pulse

2010 ◽  
Vol 322 (9-12) ◽  
pp. 1315-1318 ◽  
Author(s):  
A. Tamion ◽  
C. Raufast ◽  
E. Bonet ◽  
V. Dupuis ◽  
T. Fournier ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Field Pulse ◽  
Cobalt Cluster

Microwave Assisted Magnetization Reversal on Exchange Coupled Composite Media

2014 ◽  
Vol 931-932 ◽  
pp. 1265-1269 ◽  
Author(s):  
Naruemon Wannawong ◽  
Warunee Tipcharoen ◽  
Arkom Kaewrawang
Keyword(s):  
Magnetic Recording ◽  
Magnetization Reversal ◽  
Microwave Field ◽  
Single Layer ◽  
Microwave Frequency ◽  
Areal Density ◽  
Disk Drive ◽  
Microwave Assisted ◽  
Superparamagnetic Limit ◽  
Exchange Coupled Composite

To overcome superparamagnetic limit, microwave assisted magnetic recording (MAMR) is one interesting magnetic recording technology. Therefore, the effect of microwave on magnetization reversal in media should be analyzed. In this work, we propose the MAMR to decrease switching field (coercivity, Hsw) in exchange coupled composite (ECC) media by using the micromagnetic simulation based on the Landau - Lifshitz - Gilbert equation. The Hsw of single layer and ECC media without microwave field is 110.90 and 7.7 kOe, respectively. When the oscillating microwave field is added, Hsw of single layer media with microwave frequency of 2.5 - 40 GHz is lower than 110.90 kOe. Likewise, Hsw of ECC media with microwave frequency of 5 - 16 GHz is lower than 7.7 kOe and has the lowest value of 4.9 kOe at frequency of 10 GHz. The results from this work lead to solve superparamagnetic limit and increase areal density in hard disk drive.

Sign in / Sign up

Export Citation Format

Share Document