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Curie Point

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Define Curie Temperature

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Curie point is also named as Curie Temperature. Curie temperature is the temperature above which some changes are made due to its impact on certain magnetic materials. Curie temperature diminishes the magnetic properties of the material. 


If you consider some rocks and minerals, then you will notice that there is remnant magnetism. Also, the remnant magnetism appears below the Curie point.


The temperature is about 570 °C (almost 1,060 °F). This is the result of the general magnetic mineral magnetite. ‘Pierre Curie’ – is the name behind the temperature of Curie point. Find the definition of curie point in brief. 

Do you know the curie point of nickel? 

Nickel Curie point possesses a temperature of 627 K. 


Curie Temperature Definition

Curie point definition is very easy to understand. It is named after the French physicist. He had discovered it in 1895. He also put forward certain laws that were related to some magnetic properties in temperature change.


Let’s find something interesting that is related to the Curie point. Consider an example of iron—atoms with a temperature of 770 °C (1,418 °F). Each iron atom acts as a tiny magnet at this temperature spontaneously. Each of them will align themselves as some kind of magnetic material. 

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In the case of pure iron, the atomic magnets are distributed within each microscopic region. Pure iron is considered among the categories of Ferromagnetic materials. The directions of the magnetic fields are the same so that their magnetic fields strengthen each other.


Well, you won’t find the same in antiferromagnetic materials. Their materials possess the atomic magnets that have the alternate property of magnetic fields. They act in opposite directions. This tendency explains that their magnetic fields cancel each other. 


You may notice different types of spontaneous arrangements in ferrimagnetic materials. This is a mixture of both patterns. They are generally involved in two types of magnetic atoms. This feature enables them to yield the property of partial reinforcement of magnetic fields.


Miscellaneous Facts on Currie Point

Three classes are there that involve the raising of temperature to the Curie point. They apply to any type of material. Numerous spontaneous arrangements are found in these types of disrupts. 


Among them, only a few weak magnetic behaviours exist. All of these processes are kind of more general. We call them paramagnetism. For information, you should know about the highest Curie point as the value for cobalt is 1,121 °C (2,050 °F). 


The rise of temperature above the Curie point can lead to the production of roughly similar patterns of decreasing paramagnetism. This behavior is constant in all three classes of materials. 


When you try to cool down the temperature of these materials below their Curie points, the magnetic atoms will start to realign spontaneously. This is the behaviour that initiates the effect of ferromagnetism or antiferromagnetism among the metals.


Néel temperature is the behavior that is pointing towards the antiferromagnetic Curie point. The name is given to the term in honour of the French physicist Louis Néel. He had explained antiferromagnetism successfully in 1936.


Application of Curie Point

Steel wire has atoms that tend to behave as a magnet when they are subjected to the electric field.  At this moment, they act like tiny magnets. Each end of the steel rod turns into a north and south pole. 


Generally, these atoms do not possess any significant direction of the magnetic field. They all are in different directions. So, you can say that the steel does not exhibit any type of net magnetic field. 


At a moment when you try to bring a magnet close to the wire, it makes the steel atoms close to each other and stays in a lineup format. The queued atomic magnets help the steel wire to convert into a magnet. The steel does not have any magnetic behavior in nature, but it turns into something that attracts the original magnet.

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The process of magnetization can be disturbed by high temperatures. Thermal energy is very much responsible for the steel atoms to wobble back and forth. The energy leads to the disturbing tendency of the magnetic alignment. 


When you notice the maximum vibration among the atoms, the behaviour of being the atomic magnets do not remain as usual. At this moment, the steel gives up its magnetism. Curie point is the reason for which this occurs.


Do You Know?

You must have heard of a core of molten iron inside the earth. This iron ore cannot be magnetized, which has a temperature above the Curie point.


How the earth behaves as a magnet and possesses a magnetic field. Due to its magnetism, it has a North and a South magnetic pole. An electromagnet is a reason for the generation of the magnetic field of the earth.  


Do you know why? This is due to the passage of electrical currents flowing through the liquid metal core deep inside the earth.

FAQ (Frequently Asked Questions)

Q1. How Do You Calculate Curie Constant?

Ans: When a metal is provided with a certain amount of heat, a reverse relation is developed. The magnetization generates among the atoms and molecules is inversely proportional to temperature. This behaviour is termed Curie's law. 


The relation that stands for the Curie constant is X = C/T. Here, 'C' is the constant called the curie constant.

Q2. Explain the Law of Paramagnetism.

Ans: The law of paramagnetism states that the magnetization is inversely proportional to the temperature.


This thing happens among the many paramagnetic materials. This law explains to you that the rise in the temperature tends to gain in the paramagnetic effect in the material. However, this promotes the degradation of magnetization.

Q3. How Do You Elaborate on Ferromagnetic Domains?

Ans: Ferromagnetic domains are found among ferromagnetic materials. They are the small regions of some sort of magnetic dipoles where the alignment is parallel to each other.

Q4. Write Down the Typical Size of Magnetic Domains.

Ans: Domains are microscopic. The value of magnetic domains is to be around 10⁻⁴ to 10⁻⁶m.