Static Torsion of a Magnetostrictive Bimorph with In-Plane Anisotropy

2009 ◽  
Vol 60-61 ◽  
pp. 410-415
Author(s):  
Bai Narsu ◽  
Guo Hong Yun
Keyword(s):  
Free Energy ◽  
External Field ◽  
Magnetic Anisotropy ◽  
Cantilever Beam ◽  
Experimental Result ◽  
Minimal Free Energy ◽  
Plane Anisotropy ◽  
Flexion Response ◽  
Twisting Deformation ◽  
Static Torsion

A model for the bending and twisting deformation of the giant magnetostrictive cantilever is established in the framework of the principle of minimal free energy and four-parameter bending regime. The angular and magnitude dependence of the torsion and flexion response on the external field was discussed for cantilever beam. The torsion behavior of the cantilever is very sensitive to the external field and shows a hysteresis. Furthermore, the torsion hysteresis of the cantilever calculated by our model qualitatively agrees with recent experimental result, which suggests that our model is effective in describing the cantilever system with magnetic anisotropy.

Effect of Orientation and Microstructure on the Magnetic Anisotropy of Co/Pd Multilayers

1989 ◽  
Vol 151 ◽  
Author(s):  
Frits J. A. den Broeder ◽  
Dick Kuiper ◽  
Willem Hoving
Keyword(s):  
Magnetic Anisotropy ◽  
Deposition Temperature ◽  
Structural Deformation ◽  
Perpendicular Anisotropy ◽  
Modulation Period ◽  
Perpendicular Magnetization ◽  
Plane Anisotropy ◽  
Interface Anisotropy

ABSTRACTCo/Pd multilayers containing one to eight atomic layers of cobalt and ten atomic layers of palladium per modulation period were prepared in two orienotarteiottnoss, [111]fcc and [001]fcc. The [111] films were polycrystalline, the [001] films were epitaxial.In this paper we compare the magnetic anisotropy of both types of films, which can be described by an interface anisotropy contribution favouring perpendicular magnetization and a volume contribution favouring in-plane magnetization. Depending on the deposition temperature, a perpendicular anisotropy for [111] films is found for up to about six atomic layers of Co. The [001] films however, show perpendicular anisotropy only for Co monolayers or Co bilayers. The large difference between the anisotropies in the two orientations is mainly caused by a strong in-plane anisotropy volume term which exists for [001] films, and which is attributed to the structural deformation of the Co layers from cubic to tetragonal. For both orientations a higher deposition temperature is found to lead to an increase of the interface anisotropy due to smoothing of the layers.

Use of Minimal Free Energy and Self-Assembly To Form Shapes

1995 ◽  
Vol 7 (6) ◽  
pp. 1257-1264 ◽  
Author(s):  
Enoch Kim ◽  
George M. Whitesides
Keyword(s):  
Free Energy ◽  
Self Assembly ◽  
Minimal Free Energy

In-Plane Anisotropy In CoCr(Ta,Pt)/Cr Films Deposited onto Substrates with Controlled Topography

1998 ◽  
Vol 517 ◽  
Author(s):  
D.J. Twisselmann ◽  
B.T. Adekor ◽  
M. Farhoud ◽  
Henry I. Smith ◽  
P.C. Dorsey ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Bilayer Films ◽  
Interferometric Lithography ◽  
Plane Anisotropy ◽  
Silica Substrates

AbstractIn-plane magnetic anisotropy can be induced in Cr-underlayer/Co-alloy thin films by grooves or scratches in the substrate. To quantify this effect, silica substrates have been prepared with large areas of submicron grooves using interferometric lithography. The growth of Cr films and Cr/Co-alloy bilayer films on these substrates has been investigated, and in-plane magnetic anisotropy has been observed.

scholarly journals Magnetic Anisotropy at Nanoscale

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Marek W. Gutowski
Keyword(s):  
Free Energy ◽  
Magnetic Anisotropy ◽  
Energy Functional ◽  
Thin Layers ◽  
Free Energy Functional ◽  
Peculiar Form ◽  
Experimental Findings

Nanoscale objects often behave differently than their “normal-sized” counterparts. Sometimes it is enough to be small in just one direction to exhibit unusual features. One example of such a phenomenon is a very specific in-plane magnetic anisotropy observed sometimes in very thin layers of various materials. Here we recall a peculiar form of the free energy functional nicely describing the experimental findings but completely irrelevant and thus never observed in larger objects.

Calculation of free energy of three-dimensional uniaxial magnet in external field based on the higher non-Gaussian distribution

2009 ◽  
Author(s):  
I. V. Pylyuk ◽  
M. P. Kozlovskii ◽  
Yurij Holovatch ◽  
Bertrand Berche ◽  
Nikolai Bogolyubov ◽  
...  
Keyword(s):  
Free Energy ◽  
External Field ◽  
Gaussian Distribution ◽  
Three Dimensional ◽  
Non Gaussian

Performance Analysis of Varied Dimensions Piezoelectric Energy Harvester

2015 ◽  
Vol 754-755 ◽  
pp. 481-488
Author(s):  
Bibi Nadia Taib ◽  
Norhayati Sabani ◽  
Chan Buan Fei ◽  
Mazlee Mazalan ◽  
Mohd Azarulsani Md Azidin
Keyword(s):  
Thin Film ◽  
Low Power ◽  
Piezoelectric Material ◽  
Cantilever Beam ◽  
Physical Vapor Deposition ◽  
Output Voltage ◽  
High Energy ◽  
Experimental Result ◽  
Piezoelectric Energy ◽  
Piezoelectric Cantilever

Thin film piezoelectric material plays a vital role in micro-electromechanical systems (MEMS), due to its low power requirements and the availability of high energy harvesting. Zinc oxide is selected for piezoelectric material because of its high piezoelectric coupling coefficient, easy to deposit on silicon substrate and excellent adhesion. Deposited ZnO and Al improve the electrical properties, electrical conductivity and thermal stability. The design, fabrication and experimental test of fabricated MEMS piezoelectric cantilever beams operating in d33 mode were presented in this paper. PVD (Physical Vapor Deposition) was selected as the deposition method for aluminium while spincoating was chosen to deposit ZnO thin film. The piezoelectric cantilever beam is arranged with self-developed experimental setup consisting of DC motor and oscilloscope. Based on experimental result, the longer length of piezoelectric cantilever beam produce higher output voltage at oscilloscope. The piezoelectric cantilevers generated output voltages which were from 2.2 mV to 8.8 mV at 50 Hz operation frequency. One of four samples achieved in range of desired output voltage, 1-3 mV and the rest samples produced a higher output voltage. The output voltage is adequate for a very low power wireless sensing nodes as a substitute energy source to classic batteries.

scholarly journals Effect of Dead Load on Dynamic Characteristics of Rotating Timoshenko Beams

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yan-Qi Yin ◽  
Bo Zhang ◽  
Yue-ming Li ◽  
Wei-Zhen Lu
Keyword(s):  
Finite Element ◽  
Cantilever Beam ◽  
Dynamic Characteristics ◽  
Timoshenko Beam ◽  
Natural Frequencies ◽  
Experimental Result ◽  
Dead Load ◽  
Rotating Speed ◽  
Experimental Apparatus ◽  
The Dead

The dynamic characteristics of a rotating cantilever Timoshenko beam under dead load are investigated in this paper. Considering the predeformation caused by dead load and centrifugal force, governing equation of rotating cantilever Timoshenko beam is derived based on Hamilton’s principle, and the influence of the load on natural vibration is revealed. A suit of modal experimental apparatus for cantilever beam is designed and used to test the natural frequencies under the dead load, and the natural frequencies under rotation condition are calculated with a commercial finite element code. Both the experimental result and numerical result are utilized to compare with the present theoretical result, and the results obtained by present modeling method show a good agreement with those obtained from the experiment and finite element method. It is found that the natural frequencies of cantilever beam increase with both the dead load and the rotating speed.

Three tetracoordinate Co(ii) complexes [Co(biq)X2] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets

2015 ◽  
Vol 44 (40) ◽  
pp. 17565-17571 ◽  
Author(s):  
L. Smolko ◽  
J. Černák ◽  
M. Dušek ◽  
J. Miklovič ◽  
J. Titiš ◽  
...  
Keyword(s):  
External Field ◽  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Easy Plane ◽  
Single Molecule Magnets ◽  
Mononuclear Complexes ◽  
Superparamagnetic Behaviour

Three mononuclear complexes [CoII(biq)X2] (biq = 2,2′-biquinoline; X = Cl, Br, I) possess a sizable magnetic anisotropy, and they display a superparamagnetic behaviour in an applied external field that culminates between BDC = 0.2–0.3 T.

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