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Electron spin resonance spectroscopy
Published in D. Campbell, R.A. Pethrick, J.R. White, Polymer Characterization, 2017
D. Campbell, R.A. Pethrick, J.R. White
Interaction of the nuclear spin magnetic moment with the electron spin results in additional splitting of the electron energy levels. The magnitude of the splitting is dependent on the strength of the interaction between the electron and nuclear spins known as the hyperfine interaction. Interaction of an unpaired electron with a nuclear spin I leads to splitting of the electron energy levels into (2I + 1) sublevels. Interaction with a proton for which I = 1/2 produces splitting into two sublevels (Fig. 7.2). Similarly, the deuterium nucleus (I = 1) produces splitting into three sublevels corresponding to the quantum numbers + 1, 0, − 1.
Magnetic Materials for Nuclear Magnetic Resonance and Magnetic Resonance Imaging
Published in Sam Zhang, Dongliang Zhao, Advances in Magnetic Materials, 2017
Elizaveta Motovilova, Shaoying Huang
There is another type of magnetic moment called spin magnetic moment, or simply spin. It is an intrinsic property of all elementary particles and cannot be understood from a classical point of view. One could imagine an electron as a negatively charged sphere which spins around its own axis and thus produces a magnetic moment. However, this model does not agree with the behaviors of spin obtained from experiments. In 1922, Otto Stern and Walter Gerlach demonstrated the quantum nature of an electron spin, and that experiment gave rise to the further development of the quantum theory which fully explains the nature of spin.
Electronic Magnetic Moments
Published in David Jiles, Introduction to Magnetism and Magnetic Materials, 2015
The electronic spin angular momentum ps also generates a spin magnetic moment ms. In this case the relation is () ms=−epsme
Spin–lattice relaxation phenomena in the magnetic state of a suggested Weyl semimetal CeAlGe
Published in Philosophical Magazine, 2020
Furthermore, AC field (hac)-dependent studies of χ′ac and χ′′ac at 7 Hz, 0 T DC field is carried out at different temperatures. Figure 4(b) and inset shows the normalised (with respect to the value at 9 (10–4) T AC field) χ′ac and χ′′ac curves at different temperatures. As noted from the figure, above the ordering temperature, χ′ac varies insignificantly with hac. The below ordering temperature, χ′ac increases with increasing hac. A change of slope is noted around 5.2 K and a broad maximum is noted around 5.4 K which is centred around 4 (10–4) T. χ′′ac also increases with increasing hac for all temperatures, except in the temperature range 5.2–5.6 K. In this temperature region, a broad maximum is noted. These observations may be arising due to the presence of spin–orbit coupling. It is well known that orbital magnetic moment diminishes the magnetisation, while spin magnetic moment favours it in the presence of the external magnetic field. Equal contribution of both of these moments might be responsible for this observed maximum near the magnetic phase boundary. This observation suggests that the magnetic moments interact with lattice via the spin–orbit coupling as it is the key phenomenon responsible for the coupling of spin to the lattice [34].
Impact of iron composition on the calculated electronic and magnetic properties of Fe3−xNixSi
Published in Molecular Physics, 2019
In another hand we can calculate the total magnetic moment for full-Heusler by using Slater–Pauling rule, it will be equal to MT= ZT–24 [48,49], where ZT is the total number of valence electrons. Fe2NiSi alloys have 30 valence electrons, which generate a total magnetic moment of 6 µB. We note a disagreement between our results and those calculated by the Slater-Pauling rule. This decrease of µtotal can be observed due to the small contribution of Ni in the spin magnetic moment. Otherwise, there is competition between the magnetic coupling and covalent bonding, which is the physical mechanism. That explains why moments of these alloys disobey the Slater-Pauling rule.
A comparative DFT study of structural, electronic, thermodynamic, optical, and magnetic properties of TM (Ir, Pt, and Au) doped in small Tin (Sn5 & Sn6) clusters
Published in Phase Transitions, 2022
Aoly Ur Rahman, Dewan Mohammad Saaduzzaman, Syed Mahedi Hasan, Md. Kabir Uddin Sikder
We’ve also tabulated the total magnetic moment (μT) and local spin magnetic moment (μS) for LanL2DZ basis set in Table 5 and for SDD basis set in ST 6. From the analysis, we found no local spin magnetic moment for doping with Pt. The total magnetic moments of pristine pure Sn5 and Sn6 are 20 and 24 μT respectively. After doping for both systems, the values of the total magnetic moment have increased greatly in a periodic manner with the increase of the atomic number of the dopants.