Canted antiferromagnetism: hematite / Allan Henry Morrish. Author. Morrish, Allan H. Published. Singapore: World Scientific, c Physical Description. This text offers an extensive treatment of canted antiferromagnetism involving the Dzialoshinskii interaction as applied to hematite, the stable form of ferric oxide. Since then, the history of canted antiferromagnetism and hematite are inexorably intertwined. Indeed, hematite may be considered to be the prototype for the.
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University of Hematitw Australia. If we plot M vs H, we see:. The Phase Transitions for Hematite 4. In this case, a paramagnetic correction may be needed. The origin of magnetism lies in the orbital and spin motions of electrons and how the electrons interact with one another. Public Private login e. A related term is the saturation amtiferromagnetism which we can measure in the laboratory.
A simple representation of the magnetic spins in a ferrimagnetic oxide is shown here. Add a tag Cancel Be the first to add a tag for this edition. Ferrimagnetism is therefore similar to ferromagnetism.
In addition, the efficiency of the field in aligning the moments is opposed by the randomizing effects of temperature. Above T Nthe susceptibility obeys the Curie-Weiss law for paramagnets but with a negative intercept indicating negative exchange interactions. Unlike paramagnetic materials, the atomic moments in these materials exhibit very strong interactions.
Even though electronic exchange forces in ferromagnets are very large, thermal energy eventually overcomes the exchange and produces a randomizing effect. Materials in the last three groups exhibit long-range magnetic order below a certain critical temperature. Elastic and Magnetoelastic Interactions 8. Materials in the first two groups are those that exhibit no collective magnetic interactions and are not magnetically ordered.
The main distinction is that in some materials there is no collective interaction of atomic magnetic moments, whereas in other materials there is a very strong interaction between atomic moments. This class of materials, some of the atoms or ions in the material have a net magnetic moment due to unpaired electrons in partially filled orbitals.
Another hysteresis property is the coercivity of remanence Hr.
Classes of Magnetic Materials
The magnitude of this magnetization, at 0 K, is dependent on the spin magnetic moments of electrons. In order to set up a list of libraries that you have access to, you must first login or sign up.
It is always larger than the coercive force. Check copyright status Cite this Title Canted antiferromagnetism: This may be surprising to some, but all matter is magnetic. When you think of magnetic materials, you probably think of iron, nickel or magnetite. The best way to introduce the different types of magnetism is to describe how materials respond to magnetic fields. However, when exposed to a field, a negative magnetization is produced and thus the susceptibility is negative.
Under these conditions, paramagnetic susceptibility is proportional to the total iron content. Login to add to list. The Curie temperature is also an intrinsic property and is a diagnostic parameter that can ahtiferromagnetism used for mineral identification. University of Western Australia Library.
View online Borrow Buy Freely available Show 0 more links These interactions are produced by electronic exchange forces and result in a parallel or antiparallel alignment of atomic moments. Then set up a personal list of libraries from your profile page by clicking on your user name at the top right of any screen.
Set up My libraries How do I set up “My libraries”? In ferrimagnets, the magnetic moments of the A and B sublattices are not equal and result in a net magnetic moment.
Doped [alpha]-Fe[subscript 2]O[subscript 3]. This behavior is called hysteresis and a plot of the variation of magnetization with magnetic field is called a hysteresis loop. Author Morrish, Allan H. This particular arrangement of cations on the A and B sublattice is called an inverse spinel structure. These 2 locations in New South Wales: