Alternating current susceptibility and magnetisation of nanocrystalline Co2MnSi Heusler alloy films

IF 0.3 4区物理与天体物理 Q4 PHYSICS, MULTIDISCIPLINARY

Lithuanian Journal of Physics Pub Date : 2020-02-05 DOI:10.3952/physics.v60i1.4165

B. Vengalis, A. Maneikis, G. Grigaliūnaitė-Vonsevičienė, R. Juškėnas, A. Selskis

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引用次数: 1

Abstract

The Co2MnSi (CMS) Heusler alloy films with thickness d = 90 ÷ 110 nm were grown by DC magnetron sputtering on both nonheated and heated Si(100) and MgO(100) substrates. The films grown (annealed) at T ≥ 400°C demonstrated a nanocrystalline structure with a partially ordered B2 phase and traces of a highly ordered L21 phase as found from XRD measurements. The films deposited onto the nonheated substrates followed by annealing at Tann = 300 ÷ 500°C demonstrated a gradual increase of the saturation magnetisation, Msat, up to about 4.0 μB/f.u. (at 295 K) while the coercity field, Hc, of the films increased from about 10 to 12 kA/m with Tann increasing from 400 to 500°C. Unusually low Hc values of about 0.1 and 0.3 kA/m have been indicated for the films grown in situ at 400°C on MgO and Si, respectively. A significant increase of the Hc values found for the films grown in situ at Ts = 450°C and reduced Msat values for similar films grown at 500°C have been associated with the instability of the ordered L21 structure at high temperatures.

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纳米晶Co2MnSi Heusler合金薄膜的交流电磁化率和磁化性能

采用直流磁控溅射法在未加热和加热的Si（100）和MgO（100）衬底上生长了厚度为d=90÷110nm的Co2MnSi（CMS）Heusler合金薄膜。在T≥400°C下生长（退火）的薄膜显示出纳米晶体结构，具有部分有序的B2相和微量高度有序的L21相，如XRD测量所发现的。沉积在未加热基底上的薄膜，然后在Tann=300÷500°C下退火，表明饱和磁化率Msat逐渐增加，最高可达约4.0μB/f.u.（在295K下），而薄膜的矫顽力场Hc随着Tann从400°C增加到500°C，从约10 kA/m增加到12 kA/m。对于在400°C下在MgO和Si上原位生长的薄膜，分别显示出约0.1和0.3 kA/m的异常低的Hc值。在Ts=450°C下原位生长的薄膜的Hc值显著增加，在500°C下生长的类似薄膜的Msat值降低，这与高温下有序L21结构的不稳定性有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Lithuanian Journal of Physics 物理-物理：综合

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： The main aim of the Lithuanian Journal of Physics is to reflect the most recent advances in various fields of theoretical, experimental, and applied physics, including: mathematical and computational physics; subatomic physics; atoms and molecules; chemical physics; electrodynamics and wave processes; nonlinear and coherent optics; spectroscopy.