Magnetic memory with strain-assisted exchange coupling switch

Static information storage and retrieval – Systems using particular element – Magnetoresistive

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C365S185030, C257S421000

Reexamination Certificate

active

08054677

ABSTRACT:
A magnetic tunnel junction cell having a free layer and first pinned layer with perpendicular anisotropy, the cell including a coupling layer between the free layer and a second pinned layer, the coupling layer comprising a phase change material switchable from an antiferromagnetic state to a ferromagnetic state. In some embodiments, at least one actuator electrode proximate the coupling layer transfers a strain from the electrode to the coupling layer to switch the coupling layer from the antiferromagnetic state to the ferromagnetic state. Memory devices and methods are also described.

REFERENCES:
patent: 5461526 (1995-10-01), Hamakawa
patent: 5841692 (1998-11-01), Gallagher
patent: 5963472 (1999-10-01), Inada
patent: 6146775 (2000-11-01), Fujita et al.
patent: 6166948 (2000-12-01), Parkin
patent: 6183859 (2001-02-01), Chen
patent: 6185080 (2001-02-01), Gill
patent: 6522573 (2003-02-01), Saito
patent: 6597618 (2003-07-01), Zheng
patent: 6605772 (2003-08-01), Harman
patent: 6633498 (2003-10-01), Engel
patent: 6714444 (2004-03-01), Huai
patent: 6771534 (2004-08-01), Stipe
patent: 6781874 (2004-08-01), Hidaka
patent: 6791865 (2004-09-01), Tran
patent: 6819586 (2004-11-01), Anthony
patent: 6829161 (2004-12-01), Huai
patent: 6838740 (2005-01-01), Huai
patent: 6845038 (2005-01-01), Shukh
patent: 6847547 (2005-01-01), Albert
patent: 6888742 (2005-05-01), Nguyen
patent: 6903400 (2005-06-01), Kikuchi
patent: 6933155 (2005-08-01), Albert
patent: 6950335 (2005-09-01), Dieny
patent: 6958927 (2005-10-01), Nguyen
patent: 6963098 (2005-11-01), Daughton
patent: 6967863 (2005-11-01), Huai
patent: 6980464 (2005-12-01), Fukuzumi
patent: 6980469 (2005-12-01), Kent
patent: 6985385 (2006-01-01), Nguyen
patent: 7006336 (2006-02-01), Coffey
patent: 7020009 (2006-03-01), Ho
patent: 7031178 (2006-04-01), Parkin
patent: 7057921 (2006-06-01), Valet
patent: 7088609 (2006-08-01), Valet
patent: 7098494 (2006-08-01), Pakala
patent: 7110287 (2006-09-01), Huai
patent: 7126202 (2006-10-01), Huai
patent: 7160770 (2007-01-01), Sasaki
patent: 7161829 (2007-01-01), Huai
patent: 7170778 (2007-01-01), Kent
patent: 7180113 (2007-02-01), Braun
patent: 7180770 (2007-02-01), Perner
patent: 7187577 (2007-03-01), Wang
patent: 7190611 (2007-03-01), Nguyen
patent: 7205564 (2007-04-01), Kajiyama
patent: 7224601 (2007-05-01), Panchula
patent: 7227773 (2007-06-01), Nguyen
patent: 7230265 (2007-06-01), Kaiser
patent: 7230845 (2007-06-01), Wang
patent: 7233039 (2007-06-01), Huai
patent: 7241631 (2007-07-01), Huai
patent: 7242045 (2007-07-01), Nguyen
patent: 7242048 (2007-07-01), Huai
patent: 7245462 (2007-07-01), Huai
patent: 7252852 (2007-08-01), Parkin
patent: 7272034 (2007-09-01), Chen
patent: 7272035 (2007-09-01), Chen
patent: 7274057 (2007-09-01), Worledge
patent: 7277259 (2007-10-01), Yamamoto et al.
patent: 7286395 (2007-10-01), Chen
patent: 7289356 (2007-10-01), Diao
patent: 7307876 (2007-12-01), Kent
patent: 7310265 (2007-12-01), Zheng
patent: 7339817 (2008-03-01), Nickel
patent: 7342169 (2008-03-01), Venkatasubramanian
patent: 7345911 (2008-03-01), Min
patent: 7345912 (2008-03-01), Luo
patent: 7349243 (2008-03-01), Lin
patent: 7369427 (2008-05-01), Diao
patent: 7372116 (2008-05-01), Fullerton
patent: 7379327 (2008-05-01), Chen
patent: 7411817 (2008-08-01), Nozieres
patent: 7430135 (2008-09-01), Huai
patent: 7453720 (2008-11-01), Ju
patent: 7479193 (2009-01-01), Clark
patent: 7486545 (2009-02-01), Min
patent: 7486551 (2009-02-01), Li
patent: 7486552 (2009-02-01), Apalkov
patent: 7489541 (2009-02-01), Pakala
patent: 7502249 (2009-03-01), Ding
patent: 7508702 (2009-03-01), Ho
patent: 7515457 (2009-04-01), Chen
patent: 7518835 (2009-04-01), Huai
patent: 7525862 (2009-04-01), Sun
patent: 7576956 (2009-08-01), Huai
patent: 7660151 (2010-02-01), Leuscher
patent: 7800095 (2010-09-01), An
patent: 7804709 (2010-09-01), Wang
patent: 7821086 (2010-10-01), Kajiyama
patent: 2002/0186582 (2002-12-01), Sharma
patent: 2004/0084702 (2004-05-01), Jeong
patent: 2005/0018475 (2005-01-01), Tran
patent: 2005/0104146 (2005-05-01), Nickel
patent: 2005/0150535 (2005-07-01), Samavedam
patent: 2005/0150537 (2005-07-01), Ghoshal
patent: 2005/0213375 (2005-09-01), Perner
patent: 2006/0215444 (2006-09-01), Perner
patent: 2007/0034919 (2007-02-01), Wang
patent: 2007/0085068 (2007-04-01), Apalkov
patent: 2007/0176251 (2007-08-01), Oh
patent: 2007/0258281 (2007-11-01), Ito
patent: 2008/0019040 (2008-01-01), Zhu
patent: 2008/0037179 (2008-02-01), Ito
patent: 2008/0055792 (2008-03-01), Zheng
patent: 2008/0112094 (2008-05-01), Kent
patent: 2008/0137224 (2008-06-01), Gao
patent: 2008/0154519 (2008-06-01), Zhou
patent: 2008/0186758 (2008-08-01), Shen
patent: 2008/0225584 (2008-09-01), Gao
patent: 2008/0273380 (2008-11-01), Diao
patent: 2008/0291720 (2008-11-01), Wang
patent: 2008/0291721 (2008-11-01), Apalkov
patent: 2008/0310213 (2008-12-01), Chen
patent: 2008/0310219 (2008-12-01), Chen
patent: 2009/0010040 (2009-01-01), Takase
patent: 2009/0040855 (2009-02-01), Luo
patent: 2009/0050991 (2009-02-01), Nagai
patent: 2009/0073750 (2009-03-01), Leuschner
patent: 2009/0185410 (2009-07-01), Huai
patent: 2009/0302403 (2009-12-01), Nguyen
patent: 2010/0034008 (2010-02-01), Wang
patent: WO 2008/154519 (2008-12-01), None
Berger, L., Emission of Spin waves by a magnetic multilayer traversed by a current, Physical Review B, Oct. 1, 1996, pp. 9353-9358, vol. 54, No. 13, The American Physical Society, USA.
Florez, S.H. et al., Modification of Critical Spin Torque Current Induced by rf Excitation, Journal of Applied Physics, 103, 07a708 (2008).
Han et al., Current-Induced Butterfly Shaped Domains and Magnetization Switching in Magnetic Tunnel Junctions, Science and Technology of Advanced Materials 6 (2005) 784-788.
Hosomi et al., A Novel Nonvolatile Memory with Spin Torque Transfer Magnetization Switching: Spin-RAM, 2005 IEEE.
Johnson, M.T., et al., Magnetic anisotropy in metallic multilayers, Rep. Prog. Phys., 1996, pp. 1409-1458, vol. 59, IOP Publishing Ltd., UK.
Kawahara et al., 2Mb Spin-Transfer Torque RAM (SPRAM) with Bit-by-bit Bidirectional Current Write and Parallelizing Direction Current Read, ISSC 2007/Session 26/Non-Volatile Memories/26.5.
Kim, Chris H., et al. Dynamic Vt SRAM: A Leakage Tolerant Cache Memory for Low Voltage Microprocessors, ISLPED '02, Aug. 2002, pp. 251-254, US.
Meng et al., Spin Transfer in Nanomagnetic Devices with Perpendicular Anistropy, Applied Physics Letters 88, 172506 (2006).
Ozatay et al., “Sidewall oxide effects on spin-torque- and magnetic-field-induced reversal characteristics of thin-film nanomagnets”, Nature Materials, vol. 7, pp. 567-573 (Jul. 2008).
Prejbeanu et al., “Thermally Assisted MRAM”, J. Phys. Condens. Matter 19 (2007) 165218 (23 pp).
Rivkin, K. et al., Magnetization Reversal in the Anisotropy-Dominated Regine Using Time-Dependent Magnetic Fileds, Applied Physics Letters 89, 252507 (2006).
Seki et al., Spin-Polarized Current-Induced Magnetization Reversal in Perpendicularly Magnetized L10-FePt Layers, Applied Physics Letters 88, 172504 (2006).
Slonczewski et al., Conductance and Exchange Coupling of Two Ferromagnets Separated by a Tunneling Barrier, 1989 the American Physical Society, Physical Review B, vol. 39, No. 10, Apr. 1, 1989.
Slonczewski et al., Current-Driven Excitation of Magnetic Multilayers, Journal of Magnetism and Magnetic Materials 159 (1996) L1-L7.
Sun, Spin-Current Interaction with Monodomain Magnetic Body: A Model Study, Physical Review B, vol. 62, No. 1, Jul. 2000.
Yagami, Kojiro, et al., Inspection of Intrinsic Critical Currents for Spin-Transfer Magnetization Switching, IEEE Transactions on Magnetics, Oct. 2005, pp. 2615-2617, vol. 41, No. 10.
Zhang, L., et al., Heat-assisted magnetic probe recording on a granular CoNi/Pt multilayered film, Journal of Physics D: Applied Physics, 2006, pp. 2485-2487, vol. 39, IOP Publishing Ltd., UK.
U.S. Appl. No. 12/106,363, filed Apr. 21, 2008, Inventors: Xi et al.
U.S. Appl. No. 12/125,975, filed May 23, 2008, Inventors: Xi et al.
U.S. Appl. No. 12/239,887, filed Sep. 29, 2008, Inventors: Zheng et al.
U.S. Appl. No. 12/242,254, fil

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 memory with strain-assisted exchange coupling switch 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 memory with strain-assisted exchange coupling switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic memory with strain-assisted exchange coupling switch will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4281401

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