An overview of magnetostriction, its use and methods to measure these properties

Ekreem, Nasser B.; Olabi, Abdul–Ghani; Prescott, Tim; Rafferty, Aran; Hashmi, M.S.J.

doi:10.1016/j.jmatprotec.2007.03.064

Cited by 117 publications

(57 citation statements)

References 30 publications

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“…Cobalt ferrite nanoparticles were proposed as a promising solution in biomedical applications, such as magnetic thermo-drug delivery and hyperthermia, biosensors and magnetic resonance imaging [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Sajjia

Oubaha

Hasanuzzaman

et al. 2014

Ceramics International

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149

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In the phase of the study reported, the sol-gel technique was followed in the preparation of cobalt ferrite amorphous powder following the same procedure which was selected as the best approach as described in a previous study. It was assumed that there must be a correlation between the heat treatment operational parameters and the structural properties of the material being synthesized. Similarly, it was understood that some heat treatment is necessary to completely decompose the organic and nitrate contents present in the amorphous powder. Having ensured that the heat treatment parameters could be changed without producing a material with poorer properties, it was then possible to produce batches of powders using milder conditions in the heat treatment operation. The particle size distributions of these new batches of nanoparticles were estimated to be in the range 7-28 nm and since the results showed promise, their magnetic properties were also determined.

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Section: Introductionmentioning

confidence: 99%

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Sajjia

Oubaha

Hasanuzzaman

et al. 2014

Ceramics International

Self Cite

149

View full text Add to dashboard Cite

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“…Thus, instead of extension a contraction occurs. In both cases the magnetostrictive volume is nearly preserved [52]. For a certain magnitude of the external magnetic field, magnetostriction saturates to a corresponding value λ sat .…”

Section: Magnetostrictionmentioning

confidence: 88%

“…Via a slight modification of the sp-STM setup, the magnetostriction of the magnetic tip can be investigated directly. Some similar concepts to investigate magnetostriction and to specify the magnetostriction coefficient were explored previously [26,42,52]. In this case however, the STM tip itself is the magnetostrictive and investigated sample.…”

Section: Stm Setups To Observe Magnetostrictionmentioning

confidence: 99%

“…Within the metal crystal the electron spin and the movement of the electrons cause magnetic fields. Because of the interaction of these magnetic fields spins of different unpaired electrons close to each other align along the same direction, with the orbitals behaving similarly if possible [52]. Groups of atoms with the same alignment are arranged in domains of one magnetization direction.…”

Section: Magnetostrictionmentioning

confidence: 99%

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Spin-polarized scanning tunneling microscopy at the solid/liquid interface

Majer

Schindler

2015

Surface Science

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The spin-polarized scanning tunneling microscopy (sp-STM) is demonstrated between a magnetized STM tip and a magnetic substrate at the solid/liquid interface under electrochemical conditions at room temperature. Thereby, sp-STM at the solid/liquid interface is accomplished using the differential magnetic mode established by Wulfhekel and Kirschner for investigations at the solid/vacuum interface. The implementation of the sp-STM setup into the electrochemical STM is an important part of this thesis. Special attention is paid to the magnetostriction effect of possible magnetic STM tips. As a model system extended Co islands are electrochemically grown on an Au(111) single crystal. An appropriate electrochemical environment is required to ensure metal Co islands on Au(111), since Co deposition occurs at low potentials where hydrogen evolution and dissolved oxygen contributes to electrochemical reactions at the substrate. After sample preparation extended Co islands on Au(111) up to four atomic layers in height are observed with bare Au(111) areas in between, which is an ideal sample surface for sp-STM at the solid/liquid interface showing ferromagnetic and diamagnetic areas. Sp-STM is employed in-situ at the solid/liquid interface to observe not only sample topography but also sample magnetization of the model system Co/Au (111)

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“…Estes materiais comerciais podem ser adquiridos na forma de laminados, chapas ou alvos (CALKINS, et al, 2007;GIBBS, et al, 2001). Na década atual e na anterior, o estágio de evolução dos materiais magnetostrictivos tem permitido sua aplicação no desenvolvimento dos mais variados sensores, entre os quais se destacam os de campo magnético, posição e distância (EKREEM, et al, 2007;GILETTE, et al, 2014), como também os sensores ópticos (NAZARÉ, et al, 2014;THOMAS, et al, 2010).…”

Section: Magnetostricçãounclassified

Modelagem e fabricação de modulador em óptica integrada baseado em filme magnetostrictivo para aplicação como magnetômetro.

Lima¹

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The doctoral work aims are the development and simulation of an optical modulator based on the effect of magnetostriction for application as magnetometer. The multiphysics simulations were performed using the Finite Elements Method (FEM). In the manufacturing process of optical modulator integrated optics techniques were applied. The originality of the proposal is based on the construction of an integrated optical waveguide covered by a magnetostrictive film to allow the modulation of the guided wave, through the elasto-optical effect, by the application of external magnetic fields. The applied magnetic field causes deformation of the magnetostrictive material that induces a modification of the stress profile produced in substrate.The substrate has its optical properties altered due to the elasto-optical effect, which causes changes in the properties of transmitted light. The work begins with the study and characterization of Tb25Fe75 and Tb23Co77 magnetostrictive films deposited by sputtering on silicon substrates. A method for sample preparation and measurement of magnetostriction was established. The magnetostrictive coefficient of the films was determined from the direct measurement of displacements of samples by AFM technique for magnetic fields applied. The experimental results obtained allowed to perform MEF simulations to verify the light guided modes generated by the profile of thermally induced stress created by deposition process of magnetostrictive film on B12GeO4 (BGO) substrate. It was also modeled and simulated the effect of the application of magnetic field on the optical guide obtained initially by the effect of thermal stress. In simulation results, it was possible to verify the changes of effective refractive index and optical intensity of guided modes as functions of magnetic fields applied to the modulator. At the end of the work, some prototypes were fabricated. The results of characterizations of the built modulators will allow, in the future, adjustments in simulation models.

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An overview of magnetostriction, its use and methods to measure these properties

Cited by 117 publications

References 30 publications

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Developments of cobalt ferrite nanoparticles prepared by the sol–gel process

Spin-polarized scanning tunneling microscopy at the solid/liquid interface

Modelagem e fabricação de modulador em óptica integrada baseado em filme magnetostrictivo para aplicação como magnetômetro.

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