Unraveling oscillations at ferro(para)magnetic and non-collinear antiferromagnetic interfaces

Thiago Ferro, Luana Hildever, André José and José Holanda ()
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Thiago Ferro: Universidade Federal Rural de Pernambuco
Luana Hildever: Universidade Federal Rural de Pernambuco
André José: Universidade Federal Rural de Pernambuco
José Holanda: Universidade Federal Rural de Pernambuco

The European Physical Journal B: Condensed Matter and Complex Systems, 2024, vol. 97, issue 9, 1-5

Abstract: Abstract Here, we show that the ferro(para)magnetic and non-collinear antiferromagnetic interfaces contribute to oscillating signals observed in the magnetoresistance. We associate the effect with the fact that the spins on the surface of IrMn $$_3$$ 3 produce instability in the surface magnetoresistance of the material, which is sensitive to the magnetic field. We carried out experiments using bilayers of IrMn $$_3$$ 3 under permalloy (Py) and IrMn $$_3$$ 3 under platinum (Pt). The oscillations were intensely evident at the Py/IrMn $$_3$$ 3 interface and less explicit at the Pt/IrMn $$_3$$ 3 interface. We carried out the experiments using pulsed current, with a square pulse width of 1 $$\mu $$ μ s and amplitudes of $$I_{AC}$$ I AC = 20 $$\mu $$ μ A to 20 mA. The oscillating signals are proportional to the crystallographic direction of the material, the ferromagnetism of the material adjacent to IrMn $$_3$$ 3 , and sensitive to the amplitude of the pulsed current. We believe that observation is a way of transmitting encoded information through magnetoresistance. Graphical abstract

Date: 2024
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DOI: 10.1140/epjb/s10051-024-00789-y

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