TY - JOUR
T1 - Direct observation of room temperature magnetism in (In,Mn)As thin films by magnetic force microscopy
AU - May, S. J.
AU - Blattner, A. J.
AU - Eam, D. P.
AU - Wessels, B. W.
N1 - Funding Information:
The authors are grateful to Prof. L.J. Lauhon for discussions on scanning probe microscopy. This work is supported by the NSF under the Spin Electronics Program ECS-0224210. D.P. Eam was supported by the NSF MRSEC REU program at Northwestern University under contract DMR-0076097. Extensive use of the MRSEC Surface Science Facility at Northwestern University is acknowledged.
PY - 2006/3/15
Y1 - 2006/3/15
N2 - Variable-temperature magnetic force microscopy (MFM) has been performed over the temperature range of 298-348 K on ferromagnetic (In,Mn)As thin films deposited by metal-organic vapor phase epitaxy (MOVPE). Ferromagnetic domains were observed with submicron resolution in both single and two phase (In,Mn)As films, persisting up to 328 K. Isolated cylindrical domains ranging from 100 to 350 nm in diameter with densities of 2-5 × 10 8 cm -2 were observed in phase pure films. Longer range magnetic order, in the form of ribbon-like domains up to 1 μm in length, are present in the regions between the cylindrical domains. Two phase (In,Mn)As films produced a well-resolved complex domain structure consisting of 180° parallel and antiparallel domains. Excellent agreement between the temperature dependence of the relative magnetization obtained by MFM and superconducting quantum interference device measurements was observed.
AB - Variable-temperature magnetic force microscopy (MFM) has been performed over the temperature range of 298-348 K on ferromagnetic (In,Mn)As thin films deposited by metal-organic vapor phase epitaxy (MOVPE). Ferromagnetic domains were observed with submicron resolution in both single and two phase (In,Mn)As films, persisting up to 328 K. Isolated cylindrical domains ranging from 100 to 350 nm in diameter with densities of 2-5 × 10 8 cm -2 were observed in phase pure films. Longer range magnetic order, in the form of ribbon-like domains up to 1 μm in length, are present in the regions between the cylindrical domains. Two phase (In,Mn)As films produced a well-resolved complex domain structure consisting of 180° parallel and antiparallel domains. Excellent agreement between the temperature dependence of the relative magnetization obtained by MFM and superconducting quantum interference device measurements was observed.
KW - Ferromagnetic semiconductors
KW - Magnetic domains
KW - Magnetic force microscopy
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U2 - 10.1016/j.apsusc.2005.05.036
DO - 10.1016/j.apsusc.2005.05.036
M3 - Article
AN - SCOPUS:32644447821
SN - 0169-4332
VL - 252
SP - 3509
EP - 3513
JO - Applied Surface Science
JF - Applied Surface Science
IS - 10
ER -