Large magnetocrystalline anisotropic energy and its impact on magnetostriction of L10-FePt

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F25%3A10256671" target="_blank" >RIV/61989100:27740/25:10256671 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10487557

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1361-6463/ad8001" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6463/ad8001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6463/ad8001" target="_blank" >10.1088/1361-6463/ad8001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Large magnetocrystalline anisotropic energy and its impact on magnetostriction of L10-FePt

Popis výsledku v původním jazyce

The origin of magnetocrystalline anisotropic energy (MAE) guided by spin-orbit coupling in the L1(0)-FePt alloy was analyzed. Correlation of MAE with the calculated magnetoelastic constants in the single and polycrystal model was determined by means of first-principles calculations using density functional theory (DFT). More specifically, a systematic analysis of the large MAE and magnetostriction coefficients (lambda&apos;s) were done by means of post-processing of eigenvalues (orbital energies) and eigenfunctions (orbital occupancies). Our numerical analysis includes the convolution of the projected wave-function (density of states) of each orbital of the Fe and Pt sub-lattices into their orbital energies, which in principle should be valid for any solid regardless of the strength of the MAE. The determined anisotropic magnetostriction coefficients are of the lambda similar to 10 (- 4)-10(-3) order for several crystallographic directions; which is in accord to the known experimental data. However, the polycrystalline model based on the uniform stress approximation leads to a decrease of the lambda by two orders in the overall magnetostrictive behavior (lambda similar to 10 (- 5)). Such a large difference is not unexpected as the magnetostriction for polycrystalline FePt thin films were recorded as very low, thus validating the robustness of the current theoretical proposition of analyzing MAE.&lt;br /&gt;

Název v anglickém jazyce

Large magnetocrystalline anisotropic energy and its impact on magnetostriction of L10-FePt

Popis výsledku anglicky

The origin of magnetocrystalline anisotropic energy (MAE) guided by spin-orbit coupling in the L1(0)-FePt alloy was analyzed. Correlation of MAE with the calculated magnetoelastic constants in the single and polycrystal model was determined by means of first-principles calculations using density functional theory (DFT). More specifically, a systematic analysis of the large MAE and magnetostriction coefficients (lambda&apos;s) were done by means of post-processing of eigenvalues (orbital energies) and eigenfunctions (orbital occupancies). Our numerical analysis includes the convolution of the projected wave-function (density of states) of each orbital of the Fe and Pt sub-lattices into their orbital energies, which in principle should be valid for any solid regardless of the strength of the MAE. The determined anisotropic magnetostriction coefficients are of the lambda similar to 10 (- 4)-10(-3) order for several crystallographic directions; which is in accord to the known experimental data. However, the polycrystalline model based on the uniform stress approximation leads to a decrease of the lambda by two orders in the overall magnetostrictive behavior (lambda similar to 10 (- 5)). Such a large difference is not unexpected as the magnetostriction for polycrystalline FePt thin films were recorded as very low, thus validating the robustness of the current theoretical proposition of analyzing MAE.&lt;br /&gt;

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/EH22_008%2F0004572" target="_blank" >EH22_008/0004572: Kvantové materiály pro aplikace v udržitelných technologiích</a><br>

Návaznosti

—

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

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

nestránkováno

Kód UT WoS článku

001347962300001

EID výsledku v databázi Scopus

2-s2.0-85218638144