التفاصيل البيبلوغرافية
| العنوان: |
Formation and magnetic properties of spark plasma sintered Mn$_{3-\delta}$ ($\delta$ = 0, 1) alloys |
| المؤلفون: |
Perween, Sonam, Rathi, A., Singh, R. P., Bhattacharya, A., Raghuvanshi, Parul Rani, Madduri, P. V. Prakash, Rout, P. K., Sivaiah, B., Dhar, Ajay, Pant, R. P., Gahtori, B., Basheed, G. A. |
| سنة النشر: |
2019 |
| المجموعة: |
Condensed Matter |
| مصطلحات موضوعية: |
Condensed Matter - Materials Science |
| الوصف: |
We present the synthesis of D0$_{22}$ Mn$_{3 - \delta}$Ga ($\delta$ = 0, 1) Heusler alloys by Spark Plasma Sintering method. The single phase Mn$_3$Ga (T$_\mathrm{c}$ $\simeq$ 780 K) is synthesized, while Mn$_2$Ga (T$_\mathrm{c}$ $\simeq$ 710 K) is found to coexist with a near-stoichiometric room temperature paramagnetic Mn$_9$Ga$_5$~($\approx$ 15 \%) phase due to its lower formation energy, as confirmed from our density functional theory (DFT) calculations. The alloys show hard magnetic behavior with large room temperature spontaneous magnetization m$_s$(80 kOe) = 1.63 (0.83) $\mu_\mathrm{B}$/f.u. and coercivity H$_\mathrm{c}$ = 4.28 (3.35) kOe for Mn$_3$Ga (Mn$_2$Ga). The magnetic properties are further investigated till T$_\mathrm{c}$ and the H$_\mathrm{c}$ (T) analysis by Stoner-Wohlfarth model shows the nucleation mechanism for the magnetization reversal. The experimental results are well supported by DFT calculations, which reveal that the ground state of D0$_{22}$ Mn$_2$Ga is achieved by the removal of Mn-atoms from full Heusler Mn$_3$Ga structure in accordance with half Heusler alloy picture. |
| نوع الوثيقة: |
Working Paper |
| URL الوصول: |
http://arxiv.org/abs/1911.05040 |
| رقم الانضمام: |
edsarx.1911.05040 |
| قاعدة البيانات: |
arXiv |