Quadratic magneto-optical Kerr effect spectroscopy: polarization variation method for investigation of magnetic and magneto-optical anisotropies

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511122" target="_blank" >RIV/00216208:11320/25:10511122 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=K8FsZvv8aP" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=K8FsZvv8aP</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6463/adb760" target="_blank" >10.1088/1361-6463/adb760</a>

Result language

angličtina

Original language name

Quadratic magneto-optical Kerr effect spectroscopy: polarization variation method for investigation of magnetic and magneto-optical anisotropies

Original language description

We present a method for a precise determination of magnetic anisotropy and anisotropy of quadratic magneto-optical (MO) response of thin films of ferromagnetic and ferrimagnetic materials. The method is based on measurements of a MO response for light close to the normal incidence on the sample with a fixed position. The measurement is performed for a set of orientations of an external magnetic field and a series of incident light linear polarizations beyond the standard s and p orientations. Based on the symmetry of the signal, we are able to separate the part of MO response that is even with respect to magnetization and, in turn, to exclude all non-magnetic contributions which come from imperfections of the experimental setup or from the sample itself. It is, therefore, possible to study the sample placed inside a cryostat: the polarization changes due to cryostat windows and possible strain-induced optical anisotropy of the sample are removed by the applied data processing. Thanks to this, we can perform measurements on low or elevated temperatures (from 15 to 800 K in our case), making it possible to study the behavior of magnetic materials in different magnetic phases and/or close to phase transitions. The applicability of this experimental technique was tested by measuring the low-temperature response of two samples of ferromagnetic semiconductor (Ga,Mn)As with a different Mn content at several wavelengths, which enabled us to deduce the magnetic and quadratic MO anisotropies in this material. In particular, we observed that the anisotropy of quadratic MO coefficients in (Ga,Mn)As is much weaker than that reported previously for other magnetic material systems.

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

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OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

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

Name of the periodical

Journal of Physics D - Applied Physics

ISSN

0022-3727

e-ISSN

1361-6463

Volume of the periodical

58

Issue of the periodical within the volume

15

Country of publishing house

GB - UNITED KINGDOM

Number of pages

19

Pages from-to

155001

UT code for WoS article

001435958700001

EID of the result in the Scopus database

2-s2.0-105006734311