ANOMALOUS PRESSURE-INDUCED CHANGES IN MAGNETISM OF FERRIMAGNETIC NI-MN-SN STRUCTURES

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00128882" target="_blank" >RIV/00216224:14310/21:00128882 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.37904/nanocon.2021.4306" target="_blank" >https://doi.org/10.37904/nanocon.2021.4306</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/nanocon.2021.4306" target="_blank" >10.37904/nanocon.2021.4306</a>

Result language

angličtina

Original language name

ANOMALOUS PRESSURE-INDUCED CHANGES IN MAGNETISM OF FERRIMAGNETIC NI-MN-SN STRUCTURES

Original language description

We have performed a quantum-mechanical study of two ferrimagnetic Ni2MnSn structures, a stoichiometric one with Mn-Ni swaps and an off-stoichiometric (Ni7Mn8Sn1) alloy. We used 16-atom supercells with the atomic positions related to those in the full Heusler structure, i.e. austenite phase (unless distorted by internal distribution of point defects as in the case of Ni2MnSn with swaps). We have determined thermodynamic, magnetic and structural properties of both pressure-free states as well as those corresponding to hydrostatic pressures of a few GPa. The atomic and magnetic configurations of the studied states are found to exhibit anomalous pressure-induced changes in the total magnetic moment. In particular, the total magnetic moments per 16-atom supercells increase with increasing hydrostatic pressure. Despite this peculiar trend in the total magnetic moment, the magnitudes of local magnetic moments of Mn atoms, that are decisive for the value of the total magnetic moment, decrease with increasing hydrostatic pressure (as is common in majority of magnetic systems). The identified phenomena may be related to an interplay of a few contributing mechanisms. First, the magnetic moments of Mn atoms, that are either parallel or antiparallel to the orientation of the total magnetic moment of the supercells, nearly compensate each other due to the ferrimagnetic nature of the studied magnetic states. Second, the swapped and off-stoichiometric atoms lead to different local atomic environments of Mn atoms and, consequently, to different local magnetic moments of these atoms as well as their different response to hydrostatic pressures. Importantly, the local magnetic moments of Mn atoms, that are antiparallel to the orientation of the total magnetic moment, are more sensitive to the applied pressures. Regarding thermodynamics, the studied states are excited ones.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Article name in the collection

Proceedings 13th International Conference on Nanomaterials - Research & Application

ISBN

9788088365006

ISSN

2694-930X

e-ISSN

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Number of pages

7

Pages from-to

10-16

Publisher name

TANGER Ltd.

Place of publication

Ostrava

Event location

Brno

Event date

Oct 20, 2021

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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