Magnetic anisotropy and second-order crystal fields in some tetragonally distorted tetrahedral cobalt(II) ions

Author(s):  
M. Gerloch ◽  
J. Lewis ◽  
R. Rickards
AIP Advances ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 125053 ◽  
Author(s):  
Takahiro Ogasawara ◽  
Mikihiko Oogane ◽  
Muftah Al-Mahdawi ◽  
Masakiyo Tsunoda ◽  
Yasuo Ando

2004 ◽  
Vol 69 (14) ◽  
Author(s):  
Kyungwha Park ◽  
Tunna Baruah ◽  
Noam Bernstein ◽  
Mark R. Pederson

2021 ◽  
Vol 5 (12) ◽  
Author(s):  
Víctor H. Ortiz ◽  
Bassim Arkook ◽  
Junxue Li ◽  
Mohammed Aldosary ◽  
Mason Biggerstaff ◽  
...  

2002 ◽  
Vol 89 (25) ◽  
Author(s):  
A. Cornia ◽  
R. Sessoli ◽  
L. Sorace ◽  
D. Gatteschi ◽  
A. L. Barra ◽  
...  

2020 ◽  
Vol 223 (2) ◽  
pp. 915-933 ◽  
Author(s):  
Andrea R Biedermann ◽  
Mike Jackson ◽  
Martin Chadima ◽  
Ann M Hirt ◽  
Joshua M Feinberg

SUMMARY Exsolved iron oxides in silicate minerals can be nearly ideal palaeomagnetic recorders, due to their single-domain-like behaviour and the protection from chemical alteration by their surrounding silicate host. Because their geometry is crystallographically controlled by the host silicate, these exsolutions possess a shape preferred orientation that is ultimately controlled by the mineral fabric of the silicates. This leads to potentially significant anisotropic acquisition of remanence, which necessitates correction to make accurate interpretations in palaeodirectional and palaeointensity studies. Here, we investigate the magnetic shape anisotropy carried by magnetite exsolutions in pyroxene single crystals, and in pyroxene-bearing rocks based on torque measurements and rotational hysteresis data. Image analysis is used to characterize the orientation distribution of oxides, from which the observed anisotropy can be modelled. Both the high-field torque signal and corresponding models contain components of higher order, which cannot be accurately described by second-order tensors usually used to describe magnetic fabrics. Conversely, low-field anisotropy data do not show this complexity and can be adequately described with second-order tensors. Hence, magnetic anisotropy of silicate-hosted exsolutions is field-dependent and this should be taken into account when interpreting isolated ferromagnetic fabrics, and in anisotropy corrections.


1984 ◽  
Vol 55 (6) ◽  
pp. 2297-2299 ◽  
Author(s):  
A. M. Umarji ◽  
G. K. Shenoy ◽  
D. R. Noakes ◽  
S. Dattagupta

2014 ◽  
Vol 887-888 ◽  
pp. 779-782
Author(s):  
Leonid L. Afremov ◽  
Sergey Anisimov ◽  
Tamara Agapova

A reasonable composition of different kinds of magnetic anisotropy of bilayer film has been carried out. The criterium of magnetic uniaxiality of bilayer film contained the first-order and the second-order crystallographic anisotropy has been defined. It has been demonstrated that the effective constants of the first-order and the second-order magnetic anisotropy of bilayer film has a non-linear dependence on the corresponding constants of crystallographic anisotropy of the layers, angles between them and constants of interlayer exchange interaction.


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