adyu j sci

Adıyaman University Journal of Science

2147-1630 2146-586X

Adıyaman University

10.37094/adyujsci.987045

Condensed Matter Physics

Yoğun Madde Fiziği

Exchange Bias Effect in NiMnSbB Ferromagnetic Shape Memory Alloys Depending on Mn Content

Bor Eklenmiş NiMnSb Ferromanyetik Şekil Hatırlamalı Alaşımlarda Exchange Bias Etkisi

https://orcid.org/0000-0001-7357-2921

Kırat

Gökhan

İNÖNÜ ÜNİVERSİTESİ

12 31 2021

11 2 444 455 08 25 2021 12 03 2021

2011

Adıyaman University Journal of Science

In this study, exchange bias effect was investigated in boron added NiMnSb Heusler alloys. The samples were fabricated by arc melting method with Ni49Mn37,5Sb13,5+Bx, Ni49Mn37,7Sb13,3+Bx and Ni49Mn37,9Sb13,1+Bx nominal compositions. XRD analyzes showed that the samples were in L21 crystal structure at room temperature. While the martensitic phase transition temperatures increased, the magnetic moment value decreased with the increase in Mn content. The decrease in magnetization is owing to the increase in antiferromagnetic interactions with the increase of Mn content. Under low field and zero field cooling M-T measurements revealed that antiferromagnetic interactions were more dominant at low temperature but ferromagnetic behavior was more effective in the system at high temperature region. The coexistence of ferromagnetism and antiferromagnetism in a magnetic material can cause the exchange bias effect. Therefore, the hysteresis loops were examined at 5 K of the samples cooled under 50 kOe magnetic field. The shift at the origin of the magnetization curve, which is attributed to the exchange bias effect, increased with increasing Mn amount.

Bu çalışmada bor eklenmiş NiMnSb Heusler alaşımlarında exchange bias etkisi araştırılmıştır. Numuneler, Ni49Mn37.5Sb13.5+Bx, Ni49Mn37.7Sb13.3+Bx ve Ni49Mn37.9Sb13.1+Bx başlangıç kompozisyonunda ark ergitme yöntemiyle üretildi. XRD analizleri, örneklerin oda sıcaklığında L21 kristal yapısında olduğunu gösterdi. Mn içeriğinin artmasıyla martensitik faz geçiş sıcaklıkları artarken manyetik moment değeri azalmaktadır. Manyetizasyondaki azalma, Mn içeriğinin artmasıyla antiferromanyetik etkileşimlerdeki artıştan kaynaklanmaktadır. Düşük alan ve sıfır alan soğutması altındaki M-T ölçümleri, düşük sıcaklıkta antiferromanyetik etkileşimlerin daha baskın olduğunu, ancak yüksek sıcaklık bölgesinde sistemde ferromanyetik davranışın daha etkili olduğunu ortaya koydu. Manyetik bir malzemede ferromanyetizma ve antiferromanyetizmanın bir arada bulunması, exchange bias etkisine neden olabilir. Bu nedenle, 50 kOe manyetik alan altında soğutulan numunelerin 5 K’de histerezis döngüleri incelenmiştir. Exchange bias etkisine atfedilen manyetizasyon eğrisinin orijinindeki kayma, artan Mn miktarı ile artmıştır.

Ferromagnetic shape memory effect NiMnSb Heusler alloys exchange bias effect antiferromagnetic interactions

Ferromanyetik şekil hatırlama etkisi; NiMnSb Heusler alaşımları; Exchange bias etkisi; Antiferromanyetik etkileşimler.

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