Ferromagnetism in two-dimensional Ti0.8Co0.2O2 nanosheets

被引：84

作者：

Osada, M ^{[1
]}

Ebina, Y

Fukuda, K

Ono, K

Takada, K

Yamaura, K

Takayama-Muromachi, E

Sasaki, T

机构：

[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

[2] High Energy Accelerator Res Org, KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[3] Natl Inst Mat Sci, Superconducting Mat Ctr, Tsukuba, Ibaraki 3050044, Japan

[4] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.73.153301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated magnetic and magneto-optical properties of two-dimensional (2D) Ti0.8Co0.2O2 nanosheet, a new nanosized titanium oxide derived from layered titanates by exfoliation. Despite heavy doped 2D system in the dielectric ground, the multilayer films of Ti0.8Co0.2O2 nanosheets exhibit room-temperature ferromagnetism with magnetic moment of 1.4 mu(B)/Co. We also observe robust magnetic circular dichroism near the absorption edge at 4 eV, indicating a strong spin polarization in this 2D system. The first-principles study of Ti0.8Co0.2O2 nanosheet characterizes the ferromagnetic state with a spin-orbit-induced anisotropy.

引用

页数：4

共 20 条

[1] FERROMAGNETISM OF ULTRATHIN FILMS [J].

BANDER, M ;

MILLS, DL .

PHYSICAL REVIEW B, 1988, 38 (16) :12015-12018

[2] Donor impurity band exchange in dilute ferromagnetic oxides [J].

Coey, JMD ;

Venkatesan, M ;

Fitzgerald, CB .

NATURE MATERIALS, 2005, 4 (02) :173-179

[3] Zener model description of ferromagnetism in zinc-blende magnetic semiconductors [J].

Dietl, T ;

Ohno, H ;

Matsukura, F ;

Cibert, J ;

Ferrand, D .

SCIENCE, 2000, 287 (5455) :1019-1022

[4] Double-exchange-driven spin pairing at the (001) surface of manganites [J].

Filippetti, A ;

Pickett, WE .

PHYSICAL REVIEW B, 2000, 62 (17) :11571-11575

[5] Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2 -: art. no. 157204 [J].

Griffin, KA ;

Pakhomov, AB ;

Wang, CM ;

Heald, SM ;

Krishnan, KM .

PHYSICAL REVIEW LETTERS, 2005, 94 (15)

[6] Theory of ferromagnetism in diluted magnetic semiconductor quantum wells [J].

Lee, B ;

Jungwirth, T ;

MacDonald, AH .

PHYSICAL REVIEW B, 2000, 61 (23) :15606-15609

[7] Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide [J].

Matsumoto, Y ;

Murakami, M ;

Shono, T ;

Hasegawa, T ;

Fukumura, T ;

Kawasaki, M ;

Ahmet, P ;

Chikyow, T ;

Koshihara, S ;

Koinuma, H .

SCIENCE, 2001, 291 (5505) :854-856

[8] High temperature ferromagnetism with a giant magnetic moment in transparent Co-doped SnO2-δ -: art. no. 077205 [J].

Ogale, SB ;

Choudhary, RJ ;

Buban, JP ;

Lofland, SE ;

Shinde, SR ;

Kale, SN ;

Kulkarni, VN ;

Higgins, J ;

Lanci, C ;

Simpson, JR ;

Browning, ND ;

Das Sarma, S ;

Drew, HD ;

Greene, RL ;

Venkatesan, T .

PHYSICAL REVIEW LETTERS, 2003, 91 (07)

[9] Making nonmagnetic semiconductors ferromagnetic [J].

Ohno, H .

SCIENCE, 1998, 281 (5379) :951-956

[10] Electronic structures of doped anatase TiO2:: Ti1-xMxO2 (M=Co, Mn, Fe, Ni) -: art. no. 161201 [J].

Park, MS ;

Kwon, SK ;

Min, BI .

PHYSICAL REVIEW B, 2002, 65 (16)

← 1 2 →