Magnetic stack having assist layer

Static information storage and retrieval – Systems using particular element – Magnetic thin film

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C365S171000

Reexamination Certificate

active

07936598

ABSTRACT:
A magnetic memory cell having a ferromagnetic free layer and a ferromagnetic pinned reference layer, each having an out-of-plane magnetic anisotropy and an out-of-plane magnetization orientation and switchable by spin torque. The cell includes a ferromagnetic assist layer proximate the free layer, the assist layer having a low magnetic anisotropy less than about 500 Oe. The assist layer may have in-plane or out-of-plane anisotropy.

REFERENCES:
patent: 6462919 (2002-10-01), Mack
patent: 6650513 (2003-11-01), Fullerton
patent: 6714444 (2004-03-01), Huai
patent: 6819532 (2004-11-01), Kamijo
patent: 6829161 (2004-12-01), Huai
patent: 6838740 (2005-01-01), Huai
patent: 6847547 (2005-01-01), Albert
patent: 6888742 (2005-05-01), Nguyen
patent: 6933155 (2005-08-01), Albert
patent: 6958927 (2005-10-01), Nguyen
patent: 6967863 (2005-11-01), Huai
patent: 6985385 (2006-01-01), Nguyen
patent: 6992359 (2006-01-01), Nguyen
patent: 7057921 (2006-06-01), Valet
patent: 7088609 (2006-08-01), Valet
patent: 7110287 (2006-09-01), Huai et al.
patent: 7126202 (2006-10-01), Huai
patent: 7161829 (2007-01-01), Huai
patent: 7170778 (2007-02-01), Kawai
patent: 7190611 (2007-03-01), Nguyen
patent: 7201977 (2007-04-01), Li
patent: 7230845 (2007-06-01), Wang
patent: 7233039 (2007-06-01), Huai
patent: 7241631 (2007-07-01), Huai
patent: 7241632 (2007-07-01), Yang
patent: 7242045 (2007-07-01), Nguyen
patent: 7242048 (2007-07-01), Huai
patent: 7245462 (2007-07-01), Huai
patent: 7313013 (2007-12-01), Sun
patent: 7369427 (2008-05-01), Diao
patent: 7394248 (2008-07-01), Guo
patent: 7430135 (2008-09-01), Huai
patent: 7432574 (2008-10-01), Nakamura et al.
patent: 7486551 (2009-02-01), Li
patent: 7486552 (2009-02-01), Apalkov
patent: 7489541 (2009-02-01), Pakala
patent: 7518835 (2009-04-01), Huai
patent: 7531882 (2009-05-01), Nguyen
patent: 7576956 (2009-08-01), Huai
patent: 2005/0135020 (2005-06-01), Sugita et al.
patent: 2005/0185455 (2005-08-01), Huai
patent: 2005/0201023 (2005-09-01), Huai
patent: 2006/0132990 (2006-06-01), Morise
patent: 2006/0187705 (2006-08-01), Nakamura
patent: 2006/0203503 (2006-09-01), Casenave
patent: 2007/0008661 (2007-01-01), Min
patent: 2007/0048485 (2007-03-01), Jogo
patent: 2007/0054450 (2007-03-01), Hong
patent: 2007/0063237 (2007-03-01), Huai
patent: 2007/0086121 (2007-04-01), Nagase
patent: 2007/0096229 (2007-05-01), Yoshikawa
patent: 2007/0097734 (2007-05-01), Min
patent: 2007/0120210 (2007-05-01), Yuan
patent: 2007/0176251 (2007-08-01), Oh
patent: 2007/0188942 (2007-08-01), Beach
patent: 2007/0252186 (2007-11-01), Yang
patent: 2008/0062578 (2008-03-01), Watanabe
patent: 2008/0088980 (2008-04-01), Kitagawa
patent: 2008/0165453 (2008-07-01), Kaiser
patent: 2008/0230819 (2008-09-01), Nguyen
patent: 2008/0273380 (2008-11-01), Diao
patent: 2008/0310213 (2008-12-01), Chen
patent: 2008/0310219 (2008-12-01), Chen
patent: 2009/0050991 (2009-02-01), Nagai
patent: 2009/0079018 (2009-03-01), Nagase et al.
patent: 2009/0237987 (2009-09-01), Zhu et al.
patent: 2009/0302403 (2009-12-01), Nguyen
PCT Search Report and Written Opinion dated Jul. 21, 2010.
Sbbia, Rachid et al., Spin Transfer Switching Enhancement in Perpendicular Anisotropy Magnetic Tunnel Junctions with a Canted in-Plan Spin Polarizer, Journal of Applied Physics, American Institute of Physics, New York, U.S. LNKD-DOI:10.1063/1.3055373, vol. 105, No. 1., Jan. 6, 2009, pp. 13910, XP012119458.
U.S. Appl. No. 12/248,237, filed Oct. 9, 2008, Inventor: Zhu.
U.S. Appl. No. 12/326,274, filed Dec. 2, 2008, Inventor: Dimitrov.
U.S. Appl. No. 12/398,214, filed Mar. 5, 2009, Inventor: Wang.
J.C. Slonczewski, Current-Driven Excitation of Magnetic Multilayers, J. of Magnetism and Magnetic Materials 159 (1996) L1-L7.
L. Berger, Physic Rev. B 54, 9353 (1996).
J. Z. Sun, Spin-Current Interaction with Monodomain Magnetic Body: A Model Study, Physical Review B, vol. 62, No. 1, pp. 570-578 (2000).
Hosomi, H. Yamagishi, T. Yamamoto, K. Bessho, Y. Higo, K. Yamane, H. Yamada, M. Shoji, H. Hachino, C. Fukumoto, H. Nagao and H. Kano, “A Novel Nonvolatile Memory with Spin Torque Transfer Magnetization Switching: Spin-RAM,” Electron Devices Meeting, IEDM Technical Digest, 2005, pp. 459-462, IEEE.
Jiang et al., “Temperature Dependence of Current-Induced Magnetization Switching in Spin Valves with a Ferromagnetic CoGd Free Layer” Phys. Rev. Lett. 97, 217202 (2006).
Li et al., “Effects of MgO tunnel barrier thickness on magnetohysteresis in perpendicularly magnetized magnetic tunnel junctions of GdFeCo/FeCo/MgO/FeCo/TbFe/Co”J. Appl. Phys. 99, 08T310 (2006).
Mangin, D. Ravelosona, J. A. Katine, J. J. Carey, B. D. Terris and E. E. Fullerton, “Current-induced magnetization reversal in nanopillars with perpendicular anisotropy,” Nature Materials, 2006, pp. 210-215, vol. 5, Nature Publishing Group.
Meng et al., “Spin transfer in nanomagnetic devices with perpendicular anisotropy” J. Appl. Phys. 99, 08G519 (2006).
Miura, T. Kawahara, R. Takemura, J. Hayakawa, S. Ikeda, R. Sasaki, H. Takahashi, H. Matsuoka and H. Ohno, “A novel SPRAM (SPin-transfer torque RAM) with a synthetic ferrimagnetic free layer for higher immunity to read disturbance and reducing write-current dispersion,” 2007 Symposium on VLSI, Technology Digest of Technical Papers, pp. 234-235.
Nakayama et al., “Spin transfer switching in TbCoFe/CoFeB/MgO/CoFeB/TbCoFe magnetic tunnel junctions with perpendicular magnetic anisotropy” J. Appl Phys. vol. 103, 07A710 (2008).
Nishimura et al., “Magnetic tunnel junction device with perpendicular magnetization films for high-density magnetic random access memory” J. Appl. Phys. 91, 5246 (2002).
Ohmori, H. et al., Perpendicular Magnetic Tunnel Junction with Tunneling Magnetoresistance Ratio of 64% Using MgO (100) Barrier Layer Prepared at Room Temperature,Journal of Applied Physics, 103, 07A911 (2008).
PCT Search Report and Written Opinion dated Jul. 21, 2010, Our Ref; 14962WO00.
Sbbia, Rachid et al., Spin Transfer Switching Enhancement in Perpendicular Anisotropy Magnetic Tunnel Junctions with a Canted in-Plan Spin Polarizer, Journal of Applied Physics, American Institute of Physics, New York, U.S. LNKD-DOI:10.1063/1.3055373, vol. 105, No. 1., Jan. 6, 2009, pp. 13910, XP012119458.
U.S. Appl. No. 12/233/764 Gao et al., filed Sep. 19, 2008.
U.S. Appl. No. 12/269,537 Tang et al., filed Nov. 12, 2008.
U.S. Appl. No. 12/248,237, filed Oct. 9, 2008, Inventor: Zhu.
Xi, Haiwen and Robert M. White, Antiferromagnetic Thickness Dependence of Exchange Biasing, Physical Review B, vol. 61, No. 1, Jan. 1, 2000-1.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Magnetic stack having assist layer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic stack having assist layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic stack having assist layer will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2674753

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.