Transverse Field Effects of Al Concentration on Magnetic Properties of B2-FeAl Nanoparticle

H. Yaşar Ocaka, G. Dikici Yıldızb, Y. Göktürk Yıldızc, B. Saatçid, R. Başara, G. Sarıoğlue aDepartment of Physics, Dumlupınar University, 43100, Kütahya, Turkey bDepartment of Physics, Kırıkkale University, 71450, Kırıkkale, Turkey cDepartment of Electronics and Automation, Kırıkkale University, 71450, Kırıkkale, Turkey dDepartment of Physics, Erciyes University, 38280, Kayseri, Turkey eVocational School of Gediz, Dumlupınar University, 43100, Kütahya, Turkey

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Transverse field dependence of magnetic properties of the B2-FeAl nanoparticle (B2-FeAl-np) is investigated by using the effective field theory (or the Kaneyoshi theory) at H=0 and H=0.25. It is found that the magnetization and the Curie temperature of B2-FeAl-np decrease as the transverse field increases. A similar decrease in the magnetization and the Curie temperature of B2-FeAl is experimentally observed by Plazaola et al. with the increase (27.5%, 30%, 32.5% and 35%) of the Al content in B2-FeAl. These theoretical and experimental results revealed that the increase of the Al content in B2-FeAl-np causes an increase in the transverse field of B2-FeAl-np. Thus, the magnetization and the Curie temperature of B2-FeAl-np decrease. However, the ferromagnetic and antiferromagnetic spin splitting of paramagnetic Fe and Al atoms is obtained by a non-zero external magnetic field (H=0.25) at T>TC.

DOI:10.12693/APhysPolA.139.20 topics: B2-FeAl nanoparticle, magnetism, transverse Ising model, effective field theory