Extremely strong anisotropy of out-of-phase component of AC magnetic susceptibility in hematite single crystals and its origin

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F22%3A00561314" target="_blank" >RIV/67985831:_____/22:00561314 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/22:10457216

Result on the web

<a href="https://link.springer.com/article/10.1007/s11200-022-0829-2" target="_blank" >https://link.springer.com/article/10.1007/s11200-022-0829-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11200-022-0829-2" target="_blank" >10.1007/s11200-022-0829-2</a>

Result language

angličtina

Original language name

Extremely strong anisotropy of out-of-phase component of AC magnetic susceptibility in hematite single crystals and its origin

Original language description

So far unknown anisotropic properties of out-of-phase magnetic susceptibility (opMS) of hematite and their bearing on understanding the origin of hematite magnetism were investigated on example of four single crystals from Minas Gerais, Brazil. The research comprised measurement of directional variation of field-dependent and frequency-dependent opMS and testing whether the anisotropy of opMS can be represented by the second rank tensor. It was found that the opMS shows strong field dependence along basal plane and only weak field dependence along c-axis. As for the frequency dependence, it is virtually non-existent along the basal plane. Along the c-axis, the opMS is similar at frequencies 976 and 3904 Hz, while at 15616 Hz it is clearly higher. Consequently, opMS is dominantly due to weak field hysteresis. The minimum opMS directions are parallel to the c-axis, while the other two principal directions lie within basal plane. The degree of anisotropy is extremely high (ratio of maximum opMS to minimum opMS ≫100) and the anisotropy ellipsoid is very oblate. In stereographic diagrams, the opMS contours very roughly resemble the theoretical contours calculated from opMS tensor. However, the differences between measured and theoretical values in directional opMS are clearly higher than the measuring error and are distributed very non-homogeneously. This indicates that the second rank tensor is only very approximate representative of the spatial variation of the directional opMS of hematite single crystals. Earlier model of hematite magnetism assuming slightly scanted antiferromagnetism along the c-axis and strongly canted antiferromagnetism or even weak ferromagnetism along the basal plane is supported.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GA19-17442S" target="_blank" >GA19-17442S: Anisotropy of out-of-phase magnetic susceptibility as a new method for fabric analysis of rocks</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Studia geophysica et geodaetica

ISSN

0039-3169

e-ISSN

1573-1626

Volume of the periodical

66

Issue of the periodical within the volume

3-4

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

19

Pages from-to

187-205

UT code for WoS article

000847600900001

EID of the result in the Scopus database

2-s2.0-85137077572