Interface adjustment and exchange coupling in the IrMn/NiFe system

Spizzo, F.; Tamisari, M.; Chinni, F.; Bonfiglioli, E.; Bianco, L. Del

doi:10.1016/j.jmmm.2016.08.020

Cited by 15 publications

(16 citation statements)

References 24 publications

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“…In [47][48][49][50][51][52][53][54], the EB effect was reported in AFM/SG systems. In [49,50,55], a spin glass (SG), such as disorder, was suggested to occur at the FM-AFM interface. In [45], spin clusters such as SG states were suggested to present at the interface of layered polycrystalline thin films.…”

Section: Magnetic Measurements Of the S1 And S2 Core-shell Nanoparticlesmentioning

confidence: 99%

Tailoring Interfacial Exchange Anisotropy in Hard–Soft Core-Shell Ferrite Nanoparticles for Magnetic Hyperthermia Applications

et al. 2022

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Magnetically hard–soft core-shell ferrite nanoparticles are synthesized using an organometallic decomposition method through seed-mediated growth. Two sets of core-shell nanoparticles (S1 and S2) with different shell (Fe3O4) thicknesses and similar core (CoFe2O4) sizes are obtained by varying the initial quantities of seed nanoparticles of size 6.0 ± 1.0 nm. The nanoparticles synthesized have average sizes of 9.5 ± 1.1 (S1) and 12.2 ± 1.7 (S2) nm with corresponding shell thicknesses of 3.5 and 6.1 nm. Magnetic properties are investigated under field-cooled and zero-field-cooled conditions at several temperatures and field cooling values. Magnetic heating efficiency for magnetic hyperthermia applications is investigated by measuring the specific absorption rate (SAR) in alternating magnetic fields at several field strengths and frequencies. The exchange bias is found to have a nonmonotonic and oscillatory relationship with temperature at all fields. SAR values of both core-shell samples are found to be considerably larger than that of the single-phase bare core particles. The effective anisotropy and SAR values are found to be larger in S2 than those in S1. However, the saturation magnetization displays the opposite behavior. These results are attributed to the occurrence of spin-glass regions at the core-shell interface of different amounts in the two samples. The novel outcome is that the interfacial exchange anisotropy of core-shell nanoparticles can be tailored to produce large effective magnetic anisotropy and thus large SAR values.

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Section: Magnetic Measurements Of the S1 And S2 Core-shell Nanoparticlesmentioning

confidence: 99%

Tailoring Interfacial Exchange Anisotropy in Hard–Soft Core-Shell Ferrite Nanoparticles for Magnetic Hyperthermia Applications

et al. 2022

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“…Although, EB as an interfacial interaction between FM and AFM is widely studied [8] but the 'bulk' spin contribution to EB is still not fully established [9]. However, EB effects have been widely explored for the fundamental understanding and for its technological applications in constructing spintronic based devices such as spin valves, and magnetic random-access memories (MRAMs) etc [6,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The presence of interfacial spins and their behaviour play critical role for the origin of EB and the training effect where EB decreases with number of cycles of hysteresis loop measurement. It is reported in literature that the interface of the FM and AFM phase can be spin glass (SG) like disorder [12], compensated AFM order or uncompensated FM order. The structural disorder [12], interface roughness [13], chemical intermixing [13], interdiffusion [13] and lack of structural periodicity [12] might be a reason for this glassy state at the interface.…”

Section: Introductionmentioning

confidence: 99%

Exchange bias in Fe/Ir20Mn80 bilayers: Role of spin-glass like interface and ‘bulk’ antiferromagnet spins

Nayak

Manna

Thiruvengadam

et al. 2020

Journal of Magnetism and Magnetic Materials

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We have performed magnetic measurements like temperature (T), cooling field (H FC ) dependence of exchange bias (EB) and training effect to investigate the magnetic nature of the interface of the Fe/Ir 20 Mn 80 systems. Thin film bilayer samples of different thicknesses of Ir 20 Mn 80 have been prepared by dc magnetron sputtering at room temperature. The variation of exchange bias field (H EB ) with the increase in thickness of Ir 20 Mn 80 predicts the antiferromagnet (AFM) 'bulk' spins contribution to EB. Exponential decay of H EB and coercive field (H C ) with temperature reveals the presence of spin glass (SG) like interface. Also, the decrease of H EB with increasing H FC confirms the SG like frustration at the interface. Further, the fitting of training effect experimental data envisages the presence of frozen and rotatable spins at the magnetically frustrated interface of these EB systems. KeywordsSpin glass like interface; frozen and rotatable spins; 'bulk' AFM spins; exchange bias; exponential decay

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“…Для систем, где плоскость интерфейса однородно покрыта лишь одним атомным слоем NM, обменное смещение при низких температурах существует, но при комнатной температуре полностью исчезает [17]. Изучались температурные зависимости обменного смещения при различных толщинах немагнитной прослойки [18], но эти данные были получены лишь для узкого диапазона толщин немагнитной прослойки, который не охватывал все ситуации от полностью непокрытого до полностью покрытого слоя NM. Наконец, известно, что наличие немагнитного слоя способно влиять на рост, качество и текстурирование ферромагнитного и антиферромагнитного слоев, радикально изменяя свойства готового прибора [19].…”

Section: Introductionunclassified

Уменьшение обменного смещения, вызванное ростом эффективной толщины слоя меди в гетероструктурах NiFe/Cu/IrMn

Моргунов¹,

Bakhmet’ev²,

Таланцев³

2020

Физика Твердого Тела

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In a series of NiFe/Cu/IrMn structures with variable effective thickness of the nonmagnetic copper interlayer (up to its absence in the NiFe/IrMn sample), decrease the exchange bias and coercivity caused by increase in the effective thickness of the copper layer is observed. Merger of copper islands at the 1 nm effective Cu thickness replaces direct exchange interaction between the ferromagnetic NiFe and antiferromagnetic IrMn to indirect exchange interaction provided by the conduction electrons through the copper layer NiFe-Cu-IrMn. The structural quality of single crystalline ferro- and antiferromagnetic layers does not undergo any change and magnetization reversal happens by coherent rotation of magnetization in the all analyzed temperature range 2 - 300 K. Simulation of the dynamics of Cu deposition demonstrates the island structure of the film at the initial stages up to effective thickness 1 nm.

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Interface adjustment and exchange coupling in the IrMn/NiFe system

Cited by 15 publications

References 24 publications

Tailoring Interfacial Exchange Anisotropy in Hard–Soft Core-Shell Ferrite Nanoparticles for Magnetic Hyperthermia Applications

Tailoring Interfacial Exchange Anisotropy in Hard–Soft Core-Shell Ferrite Nanoparticles for Magnetic Hyperthermia Applications

Exchange bias in Fe/Ir20Mn80 bilayers: Role of spin-glass like interface and ‘bulk’ antiferromagnet spins

Уменьшение обменного смещения, вызванное ростом эффективной толщины слоя меди в гетероструктурах NiFe/Cu/IrMn

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