Correlating Uncompensated Antiferromagnetic Moments and Exchange Coupling Interactions in Interface Ion-Beam Bombarded Co<sub>90</sub>Fe<sub>10</sub>/CoFe-Oxide Bilayers

We have investigated the exchange coupling between a bottom FePt thin film layer capped withdifferent Mn-oxides. Results have shown that the magnetization reversal of the soft FePt layer isinfluenced strongly by the capped Mn-oxide layer (Mn, MnO, and Mn3O4), as revealed by theenhanced coercivities. Typical temperature dependent magnetization between zero-field cooled(ZFC) and field cooled (FC) scans was observed in the Mn-oxide (8%O2/Ar)/FePt bilayer thatexhibited a blocking temperature (TB 120 K) close to the Ne`el temperature, TN, of MnO.However, the Mn/FePt bilayer exhibited unusual temperature dependent of M vs. T, implying thatintermixing between Mn and FePt interfaces formed an AF FeMn that may have enabled a highirreversibility temperature (Tirr. 400 K) compared to almost identical ZFC and FC curves fromweaker exchange coupling between FePt and the Mn3O4 created with 21 and 30%O2/Ar depositionconditions

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Using different Mn-oxides to influence the magnetic anisotropy of FePt in bilayers with little change of the exchange bias field

Lin

Shueh

Liu

et al. 2013

Journal of Applied Physics

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Altering the exchange bias in Co90Fe10/(Co,Fe)O bilayers by changing the antiferromagnet's magnetism via interfacial ion-beam bombardment and different single crystalline MgO substrates

Shueh

Liu

Skoropata

et al. 2013

Journal of Applied Physics

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In this study, we investigated the exchange bias (coupling) effects in CoFe/(Co,Fe)O bilayers byusing different single crystal substrates of MgO(100) and MgO(110) and Ar ion-beambombardment on the surface of the bottom antiferromagnet (Co,Fe)O layer before capping withferromagnet CoFe. In the CoFe/(Co,Fe)O/MgO(110) bilayer, above the irreversibility temperature(Tirr. 170 K), there was a rapid decrease in M(T) with increasing temperature, unlike the CoFe/(Co,Fe)O/MgO(100) film that showed an increased Tirr. 300K and no observable decrease inM(T) above Tirr. The different M vs T zero-field-cooled/field-cooled behavior of the CoFe/(Co,Fe)O bilayers on MgO(100) and MgO(110) indicated that the FM CoFe spin orientationswere affected by the different substrates used via exchange coupling to the AF (Co,Fe)O layeraltered by MgO

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Effect of ion-beam bombardment on microstructural and magnetic properties of Ni₈₀Fe₂₀/α-Fe₂O₃thin films

Zheng

Lan

Shueh

et al. 2014

Jpn. J. Appl. Phys.

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Ion-beam bombardment has been established as an effective way to tune the microstructure and thus modify the magnetic anisotropy of thin film materials, leading to certain remarkable magnetic properties. In this work, we investigated a Ni 80 Fe 20 /α-Fe 2 O 3 bilayer deposited with a dual ionbeam deposition technique. Low-energy argon ion-beam bombardment during the α-Fe 2 O 3 deposition led to a decline of crystallinity and interfacial roughness of the bilayer, whereas the grain size distribution remained essentially unchanged. At low temperature, the coercivity exhibited a pronounced decrease after the bombardment, indicating that the effective uniaxial anisotropy in the ferromagnetic layer was dramatically reduced. Such reduction in uniaxial anisotropy was likely attributed to the irreversible transition in the α-Fe 2 O 3 grains caused by the ion-beam bombardment, which subsequently modified the anisotropy in the Ni 80 Fe 20 layer. The bombarded bilayer also exhibited a larger ΔM FC-ZFC compared to the unbombarded bilayer, which indicated a stronger exchange coupling between the ferromagnetic layer and the antiferromagnetic layer.

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Correlating Uncompensated Antiferromagnetic Moments and Exchange Coupling Interactions in Interface Ion-Beam Bombarded Co₉₀Fe₁₀/CoFe-Oxide Bilayers

Cited by 4 publications

References 28 publications

Using different Mn-oxides to influence the magnetic anisotropy of FePt in bilayers with little change of the exchange bias field

Using different Mn-oxides to influence the magnetic anisotropy of FePt in bilayers with little change of the exchange bias field

Altering the exchange bias in Co90Fe10/(Co,Fe)O bilayers by changing the antiferromagnet's magnetism via interfacial ion-beam bombardment and different single crystalline MgO substrates

Effect of ion-beam bombardment on microstructural and magnetic properties of Ni₈₀Fe₂₀/α-Fe₂O₃thin films

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Correlating Uncompensated Antiferromagnetic Moments and Exchange Coupling Interactions in Interface Ion-Beam Bombarded Co90Fe10/CoFe-Oxide Bilayers

Cited by 4 publications

References 28 publications

Using different Mn-oxides to influence the magnetic anisotropy of FePt in bilayers with little change of the exchange bias field

Using different Mn-oxides to influence the magnetic anisotropy of FePt in bilayers with little change of the exchange bias field

Altering the exchange bias in Co90Fe10/(Co,Fe)O bilayers by changing the antiferromagnet's magnetism via interfacial ion-beam bombardment and different single crystalline MgO substrates

Effect of ion-beam bombardment on microstructural and magnetic properties of Ni80Fe20/α-Fe2O3thin films

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Product

Resources

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Correlating Uncompensated Antiferromagnetic Moments and Exchange Coupling Interactions in Interface Ion-Beam Bombarded Co₉₀Fe₁₀/CoFe-Oxide Bilayers

Effect of ion-beam bombardment on microstructural and magnetic properties of Ni₈₀Fe₂₀/α-Fe₂O₃thin films