Effects of oxide seed and cap layers on magnetic properties of a synthetic spin valve

Lin, Tsann; Mauri, Daniele
April 2001
Applied Physics Letters;4/9/2001, Vol. 78 Issue 15, p2181
Academic Journal
A synthetic spin valve comprising Al[sub 2]O[sub 3]/Ni-Cr-Fe/Ni-Fe/Pt-Mn/Co-Fe/Ru/Co-Fe/Cu/Co-Fe/Ni-Fe/Cu/Al[sub 2]O[sub 3]/Ta films has been annealed and evaluated as a read sensor for ultrahigh-density (>=20 Gb/in.[sup 2]) recording. The Al[sub 2]O[sub 3] film used as its oxide seed layer provides an in situ flat surface for the Pt-Mn, Co-Fe and Ni-Fe films to develop strong {111} crystalline textures, thereby increasing its giant magnetoresistance coefficient to as high as 13.8%. Another Al[sub 2]O[sub 3] film used as its oxide cap layer protects the Co-Fe/Ni-Fe sense layers from interface mixing and oxygen interdiffusion, thus improving the soft magnetic properties and thermal stability of the sense layers. Antiferromagnetic/ferromagnetic coupling between the Pt-Mn pinning and Co-Fe/Ru/Co-Fe synthetic pinned layers is strong and thermally stable enough for proper sensor operation. Ferromagnetic/ferromagnetic coupling across the Cu spacer layer is antiparallel, and hence it is feasible to achieve optimal biasing of magnetoresistance responses. This synthetic spin valve is sandwiched into a read gap 0.1 μm in thickness, and is patterned and lapped into a read sensor 0.42 and 0.23 μm in physical width and height, respectively. With a sense current of 4 mA, this read sensor exhibits an effective read width of 0.31 μm, stable magnetoresistance responses, and signal sensitivity of 6.64 mV/μm.


Related Articles

  • Preface to Special Topic: Cutting Edge Physics in Functional Materials. Nam Nhat Hoang; Tomoyuki Yamamoto; Masato Yoshiya; Münzenberg, Markus // Journal of Applied Physics;2016, Vol. 120 Issue 14, p1 

    An introduction is presented which discusses articles within the issue on topics including ultrafast spin dynamics in the terahertz frequency region, magnetization dynamics of geometrically frustrated spin systems, and phase-to-property correlation in titanium oxide.

  • Effect of particle size and annealing on spin and phonon behavior in TbMnO3. Das, Raja; Jaiswal, Adhish; Adyanthaya, Suguna; Poddar, Pankaj // Journal of Applied Physics;Mar2011, Vol. 109 Issue 6, p064309 

    Interest has grown to study TbMnO3 as it was recently reported to show a gigantic magnetoelectric effect. Here, we report the synthesis and detailed magnetic and Raman spectroscopy study on TbMnO3 particles of size ∼25 nm and 2-3 μm, respectively. The incommensurate-commensurate...

  • Publisher's Note: "Electrical spin injection in modulation-doped GaAs from an in situ grown Fe/MgO layer" [Appl. Phys. Lett. 107, 102407 (2015)]. Seong Hoon Shim; Hyung-jun Kim; Hyun Cheol Koo; Yun-Hi Lee; Joonyeon Chang // Applied Physics Letters;11/16/2015, Vol. 107 Issue 20, p209901-1 

    A correction to the article "Electrical spin injection in modulation-doped GaAs from an in situ grown Fe/MgO layer" that was published in the september 11, 2015 issue is presented.

  • Formation of the ordered ensemble of cobalt nanocylinders in pores of anodic aluminum oxide on the surface of GaAs structures. Gudkov, V.; Dukhnovskii, M.; Vedeneev, A.; Kozlov, A.; Ryl'kov, V.; Temiryazeva, M.; Fedorov, Yu.; Bugaev, A. // Journal of Communications Technology & Electronics;Jan2013, Vol. 58 Issue 1, p72 

    A method for creation of cobalt nanocylinder quasi-regular ensembles with controlled height in the pores of anodic aluminum oxide on the surface of GaAs structures with a thin n-GaAs surface layer is developed. The pores of aluminum oxide are filled using galvanic deposition of cobalt from the...

  • Hole doping effects in (Sr2-xNax)FeMoO6 double perovskite. Zhang, Q.; Rao, G.H.; Xiao, Y.G.; Liu, G.Y.; Zhang, Y.; Liang, J.K. // Applied Physics A: Materials Science & Processing;Sep2006, Vol. 84 Issue 4, p459 

    Hole-doped double perovskite compounds (Sr,Na)2FeMoO6 with the Na content of x=0,0.02,0.03,0.07 and 0.17 have been synthesized by sol�gel method. Effects of hole doping on the crystal structure and magnetic properties of Sr2FeMoO6 have been investigated by means of X-ray powder diffraction...

  • Theoretical Investigation Of The Spin Reorientation Transition In Epitaxial Films Of NiO. Gupta, Subhra Sen; Mahadevan, Priya; Mandal, S.; Krishnakumar, S. R.; Sarma, D. D. // AIP Conference Proceedings;4/24/2008, Vol. 1003 Issue 1, p28 

    We study theoretically the spin reorientation transition in thin epitaxial films of NiO grown on Ag and MgO. Experimentally, the Ni spins point out-of-plane for films grown on the MgO substrate and in-plane for those on the Ag substrate. We successfully explain these opposite trends in the...

  • A study of the effect of iron island morphology and interface oxidation on the magnetic hysteresis of Fe-MgO (001) thin film composites. Spurgeon, Steven R.; Sloppy, Jennifer D.; Tao, Runzhe; Klie, Robert F.; Lofland, Samuel E.; Baldwin, Jon K.; Misra, Amit; Taheri, Mitra L. // Journal of Applied Physics;Jul2012, Vol. 112 Issue 1, p013905 

    Fe-MgO tunnel junctions have received much attention for their use in hard drive read heads and other spintronic applications. The system is particularly interesting because of its magnetoresistive behavior and the abundance and low cost of its constituent elements. However, many questions...

  • High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods. Chawla, Santa; Jayanthi, K.; Kotnala, R. K. // Journal of Applied Physics;Dec2009, Vol. 106 Issue 11, p113923-1 

    Recent efforts in developing spintronic and magneto-optoelectric material for applications have relied on the use of magnetic semiconductors doped with transition metals and have met with limited success. Using a fresh synthesis approach using alkali ions we demonstrate that alkali doped zinc...

  • Room-temperature ferromagnetism of Mn doped ZnO aligned nanowire arrays with temperature dependent growth. Liu, J. J.; Wang, K.; Yu, M. H.; Zhou, W. L. // Journal of Applied Physics;7/15/2007, Vol. 102 Issue 2, p024301 

    Aligned one-dimensional diluted magnetic semiconductor Zn1-xMnxO nanowires were synthesized from a reaction of metallic Zn foil and MnCl2·6H2O under oxygen environment at variant temperatures between 750 and 950 °C by a chemical vapor deposition method. The c-axis preferentially grown...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics