THermodynamics of a magnetic system

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SUMMARY

The discussion centers on calculating thermodynamic potentials for a magnetic system, specifically focusing on magnetic enthalpy represented as U[p,B] and U[p]. The participant expresses confusion regarding the variable 'p', which is clarified as a parameter analogous to pressure in magnetic systems. The conversation highlights the complexity of magnetic systems, noting that different types, such as paramagnetic gases and solids, have unique definitions of work and internal energy. Understanding these distinctions is crucial for accurate calculations in thermodynamics of magnetic systems.

PREREQUISITES
  • Understanding of thermodynamic potentials and state variables
  • Familiarity with magnetic systems and their properties
  • Knowledge of entropy (S) and its role in thermodynamics
  • Basic concepts of pressure (p) and volume (I) in physical systems
NEXT STEPS
  • Research the definitions and calculations of magnetic enthalpy in various magnetic systems
  • Study the differences between magnetic work and internal energy in thermodynamics
  • Explore the behavior of paramagnetic materials at low temperatures
  • Learn about the thermodynamic properties of composite paramagnetic systems
USEFUL FOR

Students and researchers in physics, particularly those focusing on thermodynamics and magnetic systems, as well as professionals working with materials that exhibit magnetic properties.

Feynmanfan
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I've been given the fundamental equation of a magnetic system .U(S,N,I)=...
I have to calculate some thermodynamic potentials such as U[T] etc.

One of them is the so called magnetic enthalpy and the expression for it is
U[p,B]. Another one is U[p]. How do I calculate it? I don't even know what it means.

Since I'm only used to pression, volume etc. I don't know what p is.

If S is entropy, I the equivalent of volume and B (magnetic field or whatever) the equivalent of pressure. WHat is p?
 
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Feynmanfan said:
Since I'm only used to pression, volume etc. I don't know what p is.

If S is entropy, I the equivalent of volume and B (magnetic field or whatever) the equivalent of pressure. WHat is p?
You haven't exactly explained the question very well.

Generally magnetic enthalpy is a state variable that will indicate whether the magnetic energy of the system (internal magnetic energy + magnetic work) has increased or decreased. It is just that there are different definitions of work and internal energy for a magnetic system (depending on what kind of magnetic system it is) than for an ideal gas system. You can have paramagnetic low temperature gases, paramagnetic solids, magnetic solids, nuclear magnetic or magnetic ion systems, or composite paramagnetic systems consisting of magnetic solids and gases. They have different parameters for work and internal energy.

AM
 

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