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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics D - Applied Physics

ISSN

0022-3727

e-ISSN

1361-6463

Svazek periodika

58

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

155001

Kód UT WoS článku

001435958700001

EID výsledku v databázi Scopus

2-s2.0-105006734311