Abstract
In this paper, we have sandwiched a single-atom-thick sheet of graphene, a 2-D allotrope of carbon that is exciting tremendous research interest, between two ferromagnetic electrodes. Graphene has already been shown to support spin polarized conduction, when spin polarized electrons were injected into graphene sheets along the plane using magnetic electrodes. Here, we study spin polarized conduction perpendicular the plane of the graphene in conduction perpendicular to plane (CPP) geometry. It was found that graphene was sufficient to reduce the exchange coupling between the magnetic electrodes. We also found that in a NiFe/Au/Graphene/NiFe stack, the graphene channels the spin current perpendicular to the plane and thus produces an enhanced MR effect compared to a simple stack without the graphene. A significant anisotropy was found in the observed magnetoresistance in the cross electrode geometry employed.
| Original language | English |
|---|---|
| Pages (from-to) | 2624-2627 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 44 |
| Issue number | 11 PART 2 |
| DOIs | |
| Publication status | Published - Nov 2008 |
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Keywords
- Conduction perpendicular to plane (CPP)
- Magnetoresistive device
- Permalloy
- Spin valve
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
Cite this
Graphene in multilayered CPP spin valves. / Mohiuddin, Tariq M G; Hill, Ernie; Elias, Daniel; Zhukov, Alexander; Novoselov, Konstantin; Geim, Andre.
In: IEEE Transactions on Magnetics, Vol. 44, No. 11 PART 2, 11.2008, p. 2624-2627.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Graphene in multilayered CPP spin valves
AU - Mohiuddin, Tariq M G
AU - Hill, Ernie
AU - Elias, Daniel
AU - Zhukov, Alexander
AU - Novoselov, Konstantin
AU - Geim, Andre
PY - 2008/11
Y1 - 2008/11
N2 - In this paper, we have sandwiched a single-atom-thick sheet of graphene, a 2-D allotrope of carbon that is exciting tremendous research interest, between two ferromagnetic electrodes. Graphene has already been shown to support spin polarized conduction, when spin polarized electrons were injected into graphene sheets along the plane using magnetic electrodes. Here, we study spin polarized conduction perpendicular the plane of the graphene in conduction perpendicular to plane (CPP) geometry. It was found that graphene was sufficient to reduce the exchange coupling between the magnetic electrodes. We also found that in a NiFe/Au/Graphene/NiFe stack, the graphene channels the spin current perpendicular to the plane and thus produces an enhanced MR effect compared to a simple stack without the graphene. A significant anisotropy was found in the observed magnetoresistance in the cross electrode geometry employed.
AB - In this paper, we have sandwiched a single-atom-thick sheet of graphene, a 2-D allotrope of carbon that is exciting tremendous research interest, between two ferromagnetic electrodes. Graphene has already been shown to support spin polarized conduction, when spin polarized electrons were injected into graphene sheets along the plane using magnetic electrodes. Here, we study spin polarized conduction perpendicular the plane of the graphene in conduction perpendicular to plane (CPP) geometry. It was found that graphene was sufficient to reduce the exchange coupling between the magnetic electrodes. We also found that in a NiFe/Au/Graphene/NiFe stack, the graphene channels the spin current perpendicular to the plane and thus produces an enhanced MR effect compared to a simple stack without the graphene. A significant anisotropy was found in the observed magnetoresistance in the cross electrode geometry employed.
KW - Conduction perpendicular to plane (CPP)
KW - Magnetoresistive device
KW - Permalloy
KW - Spin valve
UR - http://www.scopus.com/inward/record.url?scp=73249133444&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=73249133444&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2008.2003065
DO - 10.1109/TMAG.2008.2003065
M3 - Article
VL - 44
SP - 2624
EP - 2627
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 11 PART 2
ER -