Spin-valve heads with synthetic antiferromagnet CoFe/Ru/CoFe/IrMn

Huai, Yiming; Zhang, J.; Anderson, G. W.; Rana, P.; Funada, S.; Hung, Chiu-Yueh; Zhao, Mingkun; Tran, Sang Q.

doi:10.1063/1.369883

Cited by 67 publications

(18 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a system may consist of a stacking of an antiferromagnetic layer ͑AF͒ and two ferromagnetic layers ͑A and B͒ separated by a nonmagnetic interlayer. [10][11][12] The interaction at the interface of layer A with AF gives rise to a unidirectionnal anisotropy called exchange anisotropy. [13][14][15][16][17][18][19][20][21] This anisotropy can be modeled as a magnetic field H E , the exchange anisotropy field.…”

Section: Introductionmentioning

confidence: 99%

Study of the resonance modes of a magnetic tunnel junction-like system

Layadi

2005

Phys. Rev. B

View full text Add to dashboard Cite

The ferromagnetic resonance ͑FMR͒ modes of a magnetic tunnel junction-like system are investigated. Such a system consists of an interfacial ͑F/AF͒ interaction described by an exchange anisotropy field H E and a magnetic coupling of two ferromagnetic layers separated by a nonmagnetic interlayer. The latter interaction is accounted for by bilinear J 1 and biquadratic J 2 coupling strengths. The dispersion relation, the resonant frequency, f, as well as the corresponding mode intensity, I, versus applied field H curves, have been studied. Analytical formulas for the resonance condition and intensity have been derived for the low magnetic coupling/ high exchange anisotropy case. In this situation, the system is found to behave as two uncoupled layers with magnetic characteristics different from those of the initial layers; the effect of the low coupling is to modify the different anisotropies: J 1 contributes to the exchange anisotropy while J 2 modifies the magnetocrystalline anisotropies. For very strong coupling, the system behaves as a single ͑F/AF͒ system with effective exchange and magnetocrystalline anisotropy fields; these fields have been derived as a function of the individual layer magnetic parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the resonance modes of a magnetic tunnel junction-like system

Layadi

2005

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…We deposited a synthetic antiferromagnet (Co-10 mol%Fe, P1 30 nm/Ru 8 nm/Co-10 mol%Fe, P2 30 nm) between Mn-17 mol%Ir-2 mol%Pt and Cu layers of bottom SVs. 8) The spin rotation of a pinned layer is controlled by the magnetization reversal of P1 (adjacent with Mn-17 mol%Ir-2 mol%Pt) and P2 (adjacent with Cu). The strong AFM coupling of P1 and P2 contributes to the large H ex , which is called the effective exchange field (H eff,ex ) in a synthetic SV.…”

Section: Resultsmentioning

confidence: 99%

Exchange Bias and Spin-Valve Giant Magnetoresistance in Multilayers with Mn-17 mol%Ir-2 mol%Pt Antiferromagnetic Layer

Jeon

Kim

et al. 2002

Mater. Trans.

View full text Add to dashboard Cite

We fabricated bottom spin valves (SV) films using Mn-17 mol%Ir-2 mol%Pt antiferromagnetic material. A bottom SV composing of Ta/Ni-20 mol%Fe seed layer shows an improved exchange field (H ex ). The high H ex of about 17.4 kA/m was obtained in Si(100)/Ta 3 nm/NiFe 3 nm/Mn-17 mol%Ir-2 mol%Pt 7 nm/Co-10 mol%Fe 1 nm/NiFe 5 nm/Ta exchange biasing layer. The giant magnetoresistance (GMR) and the thermal stability of bottom SVs were evaluated by comparing with a top SV. Bottom SV showed the higher GMR ratio of about 5.2% than a top SV with same thick ferromagnetic layer. It seems that a large short circuit effect of conductance in a free layer of a bottom spin valve. In order to improve thermal stability of a bottom SV, we inserted the synthetic antiferromagnetically coupled pinned layers (Co-Fe/Ru/Co-Fe) between the Mn-17 mol%Ir-2 mol%Pt and Cu layers. Thus, the enhanced thermal stability of H ex can be obtained in bottom synthetic SVs.

show abstract

“…With shrinking read gap thickness, PtMn eventually was abandoned for IrMn due to its relatively large minimum thickness requirement. Rather than using a single pinned layer as the reference layer, an antiparallel coupled pinned layer structure is commonly used [37,38], which comprises the PL, typically a CoFe-based multilayer, being exchange coupled to the AF at its lower interface; the ACL; and the RL, typically a CoFe-and CoFeB-based multilayer, in contact with the tunnel junction at its upper interface.…”

Section: Growth and Processing Of Tunneling Magnetoresistance Sensorsmentioning

confidence: 99%

Physics and Design of Hard Disk Drive Magnetic Recording Read Heads

Maat¹,

Marley²

2014

Handbook of Spintronics

View full text Add to dashboard Cite

Magnetic recording heads always have been on the forefront of technology. A finished magnetic recording head that is manufactured in high volume is the outcome of a coordinated effort of various scientific and engineering disciplines. This chapter will focus on the physics and design of modern magnetic recording read heads. It will explain the underlying concepts of thin film magnetism and electron transport in nanostructures and describe the aspects of device scaling, magnetic stabilization, signal-to-noise considerations, and read-back performance of currently employed tunnel magnetoresistive read heads. An outlook on possible future read-head technologies such as currentperpendicular-to-the-plane giant magnetoresistance, scissor, two-dimensional magnetic recording, and spin-torque sensors will be given. List of Abbreviations

show abstract

Spin-valve heads with synthetic antiferromagnet CoFe/Ru/CoFe/IrMn

Cited by 67 publications

References 3 publications

Study of the resonance modes of a magnetic tunnel junction-like system

Study of the resonance modes of a magnetic tunnel junction-like system

Exchange Bias and Spin-Valve Giant Magnetoresistance in Multilayers with Mn-17 mol%Ir-2 mol%Pt Antiferromagnetic Layer

Physics and Design of Hard Disk Drive Magnetic Recording Read Heads

Contact Info

Product

Resources

About