Presentation Nloc 2 Siap Font Xde Backgroud

7/30/2019 Presentation Nloc 2 Siap Font Xde Backgroud

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Nur Liyana Aqmar Binti Kamal Ariffin

Mohamed Shakimi Bin Hanafi

Mohamad Azri Bin Ibrahim


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Outlines Introduction

Objectives

Brief Theory

Methodology

Results and Discussion

Conclusions

Acknowledgement


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Introduction

Magneticmaterial

hardsoft

intrinsic extrinsic


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Objectives To examine the magnetic transition from ferromagnetism to

paramagnetism in soft magnetic material.

To determine the Curie temperature.

To learn about the basic principles of magnetic hysteresis

To learn about the properties of ferromagnetic materials.


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Brief theory

Types of magnetism:

Ferromagnetism AntiferromagnetismFerrimagnetism Paramagnetism


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Temperature dependence

Curie Temperature, Tc

Ferromagnetism Ferrimagnetism Paramagnetism

Above a critical temperature called the Curie temperature (TC), ferromagnetic and

ferrimagnetic materials no longer possess a spontaneous magnetization and become

PARAMAGNETIC


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Hysteresis loop


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MethodologyChemical Formula0.3NiO+0.7ZnO+Fe2O3Ni0.3Zn0.7Fe2O4

Sintering at 900oC Magnetic properties

characterizations

Curie

temperatureHysteresis loop

HP4294A Precision

Impedance Analyzer Linkjoin MATS 2010SDHysteresisgraph


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Results and discussion

Curie temperature

y = -0.4531x + 39.789

0.0000E+00

5.0000E+00

1.0000E+01

1.5000E+01

2.0000E+01

2.5000E+01

3.0000E+01

0 20 40 60 80 100 120 140 160

InitialPermeability

Temperature (oC)


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Discussion From the graph, the curie temperature was found as 87.8oC.

This curie temperature represent the changes of magnetism

behaviour from ferromagnetism to paramagnetism.


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Hysteresis

-0.02

-0.015

-0.01

-0.005

0

0.005

0.01

0.015

0.02

-1500 -1000 -500 0 500 1000 1500

B (T)

H(A/m)

1

2

3


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Discussion When magnetic field applied on the sample reached the

saturation level, all the direction of magnetic moment are

parallel to each other.

When the magnetic field being removed, only partial of the

magnetic moment direction changes the direction and results in

having remanance.

From the graph, magnetic saturation induction, B and

coercivity field, Hc value of 0.01T and 785.33 A/mrespectively.


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Conclusion Ni0.3Zn0.7Fe2O4 was well characterized using the hysteresis

graph and curie temperature measurement.

The magnetism behaviour changes from ferromagnetism to

paramagnetism at curie temperature of 87.8oC.

Ni0.3Zn0.7Fe2O4 can be characterised as a soft magnetic

material with its magnetic saturation induction, B and

coercivity field, Hc value of 0.01T and 785.33 A/m

respectively.


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Acknowledgement


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Presentation Nloc 2 Siap Font Xde Backgroud