Enhanced blocking temperature in (Pt/Co)$_3$/IrMn/Co and (Pd/Co)$_3$/IrMn/Co trilayers with ultrathin IrMn layer

G. Vinai; J. Moritz; S. Bandiera; I. L. Prejbeanu; B. Dieny

Enhanced blocking temperature in (Pt/Co)$_3$/IrMn/Co and (Pd/Co)$_3$/IrMn/Co trilayers with ultrathin IrMn layer

G. Vinai ^{1, 2} J. Moritz ¹ S. Bandiera ¹ I. L. Prejbeanu ^{1, 2} B. Dieny ¹

1 SPINTEC - SPINtronique et TEchnologie des Composants

Abstract : rMn blocking temperature ($T_B$) is compared between IrMn/Co bilayers and (Pt/Co)$_3$/IrMn/Co and (Pd/Co)$_3$/IrMn/Co trilayers for different IrMn thicknesses. Exchange bias field ($H_{ex}$) is measured from 5 to 400 K. Trilayers show a more concave thermal decrease of $H_{ex}$($T$) compared to bilayers and, for thin IrMn layers, larger $T_B$ and sharper peak of coercive field Hc around $TB$. This $H_{ex}$($T$) behaviour presents improved characteristics for thermally assisted-MRAM (TA-MRAM) applications, with large $H_{ex}$/$H_c$ ratio. Two physical explanations are proposed: an indirect IrMn intergrain coupling through the (Pt(Pd)/Co)$_3$layer and a reduction of IrMn/Co interfacial coupling due to out-of-plane canting of the IrMn spins.

Document type :

Journal articles

Domain :

Physics [physics]

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https://hal-cea.archives-ouvertes.fr/cea-01073003
Contributor : Bruno Savelli <>
Submitted on : Wednesday, October 8, 2014 - 3:53:18 PM
Last modification on : Thursday, April 4, 2019 - 9:44:02 AM

Enhanced blocking temperature in (Pt/Co)$_3$/IrMn/Co and (Pd/Co)$_3$/IrMn/Co trilayers with ultrathin IrMn layer

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Enhanced blocking temperature in (Pt/Co)$_3$/IrMn/Co and (Pd/Co)$_3$/IrMn/Co trilayers with ultrathin IrMn layer

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