Large Exchange Bias and High Blocking Temperature of MgO-Barrier-MTJs With L1$_{2}$-Ordered Mn$_{3}$Ir

Komagaki, K.; Yamada, Kazuhiko; Noma, K.; Kanai, H.; Kobayashi, Kazuo; Uehara, Yoshio; Tsunoda, Masakiyo; Takahashi, M.

doi:10.1109/tmag.2007.893695

Cited by 17 publications

(20 citation statements)

References 6 publications

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“…The giant exchange anisotropy and high annealing tolerance are reported in -ordered Mn Ir/CoFe bilayers [1], [2]. The present authors have confirmed a high performance in the exchange bias properties induced by the -Mn Ir as an antiferromagnetic (AF) layer in the MgO-based magnetic tunnel junction (MTJ) [3], which is the most promising candidate for the read-head element of ultra-high density recording because of its large magnetoresistance ratio [4]- [6].…”

Section: Introductionsupporting

confidence: 68%

“…The MnIr layers were deposited at the substrate temperature of 200 C and with sputtering Ar gas pressure of 2.0 Pa in order to obtain the -ordered phase [2]. Formation of the -Mn Ir phase was confirmed with X-ray diffractometry (XRD) and grazing incident XRD (GID), as described in our previous report [3]. The in-plane lattice parameter of the -Mn Ir was 1.344 for .…”

Section: Introductionmentioning

confidence: 91%

“…Thermal annealing was performed in vacuum at 250 C-380 C for 4 h and cooled down to room temperature (RT) under applying magnetic field of 15 kOe. The blocking temperature of 10-nm-thick -Mn Ir was 350 C [3]. The Co compositions and the thickness of each layer were determined with X-ray fluorescence analysis.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Exchange Anisotropy by Ultra-Thin Co$_{x}$ Fe$_{100 - x}(x> 80)$ Layer Insertion at the Interface of ${\rm L1}_{2}$-Ordered Mn$_{3}$Ir/Co$_{65}$Fe$_{35}$ Bilayers

et al. 2008

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We have investigated the exchange anisotropy in L1 2 -ordered Mn 3 Ir/Co 65 Fe 35 bilayers with inserting ultra-thin Co Fe 100 ( 65) layer at the interface between L1 2 -Mn 3 Ir and Co 65 Fe 35 layer. The unidirectional anisotropy constant, , was enhanced from 0.93 erg/cm 2 to 1.2erg/cm 2 at the range from 85 to 98 at.% of Co composition in Co Fe 100 insertion layer. The crystal structure of the ultra-thin Co 90 Fe 10 insertion layer was transformed to bcc structure following the bcc structured Co 65 Fe 35 layer during thermal annealing. These results suggest that the enhancement of exchange anisotropy with ultra-thin Co Fe 100 ( 80) insertion layer is attributed to the Co-rich bcc phase formation in the insertion layer.Index Terms-Co Fe 100 ( 80) insertion layer, exchange anisotropy, L1 2 -ordered Mn 3 Ir, unidirectional anisotropy constant, K .

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Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 91%

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Enhanced Exchange Anisotropy by Ultra-Thin Co$_{x}$ Fe$_{100 - x}(x> 80)$ Layer Insertion at the Interface of ${\rm L1}_{2}$-Ordered Mn$_{3}$Ir/Co$_{65}$Fe$_{35}$ Bilayers

et al. 2008

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“…It was examined changing into Material B. The particle diameter distribution of Material B was smaller than the one of Material A, and the blocking temperature was also higher than the one of Material A [14]- [16]. The sample heads were proved with Material B.…”

Section: B Improvement In Categorymentioning

confidence: 99%

Read Performance Reliability in TMR Head

Miyatake

Kugiya

Kodama

2012

IEEE Trans. Device Mater. Relib.

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Causes of head instability and design improvements in tunneling magnetoresistive heads are discussed. Head instability results in output signal amplitude changes and/or signal distortion due to the output noise. Under accelerated environmental conditions, a test using an original "ΔV −H tester" was done to study and analyze the conditions of which instability occurs. From the result of the test, instability was classified into four categories. The improved sample heads were prepared, and the effectiveness was proved.Index Terms-Instability, thermal fly-height control (TFC), tunneling magnetoresistive (TMR) head, ΔV −H tester.

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“…4. When the L1 2 -Mn 3 Ir/Co-Fe bilayer is combined with MgO barrier-based magnetic tunnel junctions, excellent resistance response to an external applied field (R-H loop) is obtained with a giant TMR ratio [34]. That is, L1 2 -Mn 3 Ir is a great candidate for an AFM layer of the spin-valve read head in ultrahigh density HDDs.…”

Section: Exchange Anisotropy In Spin-valve Headmentioning

confidence: 99%

Tailor-made nano-structured materials for perpendicular recording media and head—precise control of direct/indirect exchange coupling

Takahashi¹,

Tsunoda²,

Saito³

2009

Journal of Magnetism and Magnetic Materials

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Large Exchange Bias and High Blocking Temperature of MgO-Barrier-MTJs With L1$_{2}$-Ordered Mn$_{3}$Ir

Cited by 17 publications

References 6 publications

Enhanced Exchange Anisotropy by Ultra-Thin Co$_{x}$ Fe$_{100 - x}(x> 80)$ Layer Insertion at the Interface of ${\rm L1}_{2}$-Ordered Mn$_{3}$Ir/Co$_{65}$Fe$_{35}$ Bilayers

Enhanced Exchange Anisotropy by Ultra-Thin Co$_{x}$ Fe$_{100 - x}(x> 80)$ Layer Insertion at the Interface of ${\rm L1}_{2}$-Ordered Mn$_{3}$Ir/Co$_{65}$Fe$_{35}$ Bilayers

Read Performance Reliability in TMR Head

Tailor-made nano-structured materials for perpendicular recording media and head—precise control of direct/indirect exchange coupling

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