TY - JOUR
T1 - Half-Metallic Fe3O4 Films for High-Sensitivity Magnetoresistive Devices
AU - Takahashi, H.
AU - Soeya, S.
AU - Hayakawa, J.
AU - Ito, K.
AU - Kida, A.
AU - Asano, H.
AU - Matsui, M.
N1 - Funding Information:
Manuscript received July 1, 2003. This work was supported in part by the IT-program of RR2002 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan.
PY - 2004/1
Y1 - 2004/1
N2 - By RF sputtering on a MgO (100) substrate, we have made Fe 3O4 (111) metal and Fe3O4 (001)/TiN (001) films that have Verwey temperature (TV) near 120 K. The saturation magnetizations and resistivities of those Fe3O4 films were comparable to those of bulk Fe3O4, and the magnetoresistive (MR) ratio and MR ratio area product AΔR measured for various materials structures of current perpendicular to plane (CPP) samples using Fe3O4 (111) increased sharply at 120 K. This increase around TV seemed to be related to the change in the Fe 3O4 crystal. The AΔR and MR of CPP-GMR samples using Fe3O4 (001), on the other hand, such as Ni 80Fe20/TiN/Fe3O4 (001)/TiN (001), Co75Fe25/TiN/Fe3O4 (001)/TiN (001), and Fe3O4/TiN/Fe3O4 (001)/TiN (001), were 2-4 times larger than those of CPP-GMR samples using Fe3O 4 (111) were. And for Fe3O4 (001) the increase of MR at TV was smaller than it was for Fe3O4 (111).
AB - By RF sputtering on a MgO (100) substrate, we have made Fe 3O4 (111) metal and Fe3O4 (001)/TiN (001) films that have Verwey temperature (TV) near 120 K. The saturation magnetizations and resistivities of those Fe3O4 films were comparable to those of bulk Fe3O4, and the magnetoresistive (MR) ratio and MR ratio area product AΔR measured for various materials structures of current perpendicular to plane (CPP) samples using Fe3O4 (111) increased sharply at 120 K. This increase around TV seemed to be related to the change in the Fe 3O4 crystal. The AΔR and MR of CPP-GMR samples using Fe3O4 (001), on the other hand, such as Ni 80Fe20/TiN/Fe3O4 (001)/TiN (001), Co75Fe25/TiN/Fe3O4 (001)/TiN (001), and Fe3O4/TiN/Fe3O4 (001)/TiN (001), were 2-4 times larger than those of CPP-GMR samples using Fe3O 4 (111) were. And for Fe3O4 (001) the increase of MR at TV was smaller than it was for Fe3O4 (111).
KW - Current perpendicular to plane
KW - FeO
KW - Magnetoresistive effect
KW - TiN
KW - Verway temperature
UR - http://www.scopus.com/inward/record.url?scp=1342286870&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1342286870&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2003.821164
DO - 10.1109/TMAG.2003.821164
M3 - Article
AN - SCOPUS:1342286870
VL - 40
SP - 313
EP - 318
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 1 II
ER -