Reducing the critical current for spin-transfer switching of perpendicularly magnetized nanomagnets

Mangin, S.; Henry, Y.; Ravelosona, D.; Katine, J. A.; Fullerton, Eric E.
January 2009
Applied Physics Letters;1/5/2009, Vol. 94 Issue 1, p012502
Academic Journal
We describe nanopillar spin valves with perpendicular anisotropy designed to reduce the critical current needed for spin transfer magnetization reversal while maintaining thermal stability. By adjusting the perpendicular anisotropy and volume of the free element consisting of a [Co/Ni] multilayer, we observe that the critical current scales with the height of the anisotropy energy barrier and we achieve critical currents as low as 120 μA in quasistatic room-temperature measurements of a 45 nm diameter device. The field-current phase diagram of such a device is presented.


Related Articles

  • Effects of perpendicular anisotropy on the interlayer coupling in perpendicularly magnetized [Pd/Co]/Cu/[Co/Pd] spin valves. Thiyagarajah, Naganivetha; Bae, Seongtae; Joo, Ho Wan; Han, Young Chul; Kim, Jongryoul // Applied Physics Letters;2/11/2008, Vol. 92 Issue 6, p062504 

    The effects of perpendicular anisotropy on the interlayer coupling in perpendicularly magnetized [Pd/Co]/Cu/[Co/Pd] spin valves have been explored. It was clearly confirmed that the perpendicular anisotropy of soft and hard [Co/Pd] multilayers plays a crucial role in determining the physical...

  • Spin-valve sensor with an out-of-plane magnetic anisotropy: For small field sensing applications. Lee, Kisu; Park, Moon-Jung; Lee, Seungkyo; Kim, Ju-Young; Cho, B. K. // Journal of Applied Physics;Apr2010, Vol. 107 Issue 7, p073905 

    This study investigates a spin-valve sensor, which consists of ferromagnetic layers with both an out-of-plane magnetic anisotropy (NiFe/Tb/NiFe layers) and an in-plane magnetic anisotropy (CoFe/IrMn layers). The out-of-plane magnetic anisotropy was able to be tuned by varying the thickness (tTb)...

  • Lorentz microscopy studies of the variation with temperature and processing conditions of free layer reversal mechanisms in spin valves. Lim, C. K.; Chapman, J. N.; Rahman, M.; Johnston, A. B.; O'donnell, D. O. // Journal of Applied Physics;2/1/2004, Vol. 95 Issue 3, p1510 

    The reversal process of the free layer of two spin valves (SVs) with crossed anisotropy was studied as a function of temperature by transmission electron microscopy. In situ magnetizing experiments were carried out using the Fresnel imaging mode at room temperature, 100 °C, and 200 °C. The...

  • Highly sensitive linear spin valve realized by tuning 90° coupling in a NiFe/thin IrMn/biased NiFe structure through nonmagnetic spacer insertion. Liu, T.; Zhu, T.; Cai, J. W.; Sun, L. // Journal of Applied Physics;May2011, Vol. 109 Issue 9, p094504 

    90° magnetic coupling between a free NiFe layer and an exchange biased NiFe layer has been realized using a thin IrMn intermediate film. This 90° coupling remains after the addition of a nonmagnetic spacer (Cu, Pt, Ru, or Ta) at the free NiFe/IrMn interface. Effective anisotropy strength...

  • Impedance behavior of spin-valve transistor. Peng, T. Y.; Chen, S. Y.; Hsieh, L. C.; Lo, C. K.; Huang, Y. W.; Chien, W. C.; Yao, Y. D. // Journal of Applied Physics;4/15/2006, Vol. 99 Issue 8, p08H710 

    The magnetoimpedance (MZ) effect of the pseudo-spin-valve transistor (PSVT) was investigated at room temperature in the frequency ranged from 100 Hz to 15 MHz. The PSVT can be regarded as a complex combination of resistors, inductors, and capacitors, while the impedance (Z) consists of a real...

  • Electrical spin injection and accumulation in ferromagnetic/Au/ferromagnetic lateral spin valves. Ku, J.; Chang, J.; Han, S.; Ha, J.; Eom, J. // Journal of Applied Physics;4/15/2006, Vol. 99 Issue 8, p08H705 

    Spin injection and accumulation have been investigated for Ni81Fe19/Au/Ni81Fe19 lateral spin valves with various separations between spin injector and detector. The spin valve has been studied by using two distinct measurement configurations: the local and nonlocal measurement configurations....

  • Neutron powder diffraction study and magnetic properties in LaMn1-xCuxO3 (x=0.05, 0.10 and 0.15). Samantaray, B.; Srivastava, S. K.; Mohanty, S.; Ravi, S.; Dhiman, I.; Das, A. // Journal of Applied Physics;May2010, Vol. 107 Issue 9, p09D719-1 

    LaMn1-xCuxO3 (x=0.05 to 0.15) samples were prepared and their crystal structure and magnetic properties were studied by recording neutron powder diffraction patterns and M-H loops at different temperatures. Even though the samples were free from impurity, the x=0.05 and 0.10 samples are found to...

  • Reducing the critical switching current in nanoscale spin valves. Manschot, Jan; Brataas, Arne; Bauer, Gerrit E. W. // Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3250 

    The current induced magnetization reversal in nanoscale spin valves is a potential alternative to magnetic field switching in magnetic memories. We show that the critical switching current can be decreased by an order of magnitude by strategically distributing the resistances in the magnetically...

  • Current-induced dynamics in asymmetric spin valves. Gmitra, Martin; Barnas, Jozef // Applied Physics Letters;11/27/2006, Vol. 89 Issue 22, p223121 

    Spin transfer in an asymmetric nanopillar spin valve is studied numerically in the diffusive transport regime. The system considered includes a pinned synthetic antiferromagnetic structure, which is separated from the sensing layer by a thin nonmagnetic film. Landau-Lifshitz-Gilbert equation,...


Read the Article


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

Try another library?
Sign out of this library

Other Topics