Effects of magnetic anisotropy on magnetization in molecular mesoscopic magnet Fe8

被引：16

作者：

Ueda, M ^{[1
]}

Maegawa, S

Miyasaka, H

Kitagawa, S

机构：

[1] Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 6068501, Japan

[2] Kyoto Univ, Fac Engn, Kyoto 6068501, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2001年 / 70卷 / 10期

关键词：

molecular magnets; magnetization; anisotropy; mesoscopic magnets;

D O I：

10.1143/JPSJ.70.3084

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the temperature, magnetic field and angular dependences of the magnetization of a single crystal of a molecular mesoscopic magnet [(C6H15N3)(6)Fe8O2(OH)(12)]Br-7 (H2O)Br . 8H(2)O, Fe8. The molecule Fe8 consists of eight Fe3+ ions with spins of s = 5/2. The experimental results of the magnetizations at low temperatures show large anisotropy that is dependent on the orientation of the external magnetic field with respect to the crystal axis. These results are well explained by the Hamiltonian for an isolated molecule with total spin S = 10 and anisotropies of D = -0.276 K and E = -0.035 K. The easy axis is determined to be oriented with an azimuthal angle of 16 degrees from the a-axis in the ab-plane and an inclinational angle of 0.7 degrees from the ab-plane.

引用

页码：3084 / 3088

页数：5

共 13 条

[1]

Barra AL, 2000, CHEM-EUR J, V6, P1608, DOI 10.1002/(SICI)1521-3765(20000502)6:9<1608::AID-CHEM1608>3.3.CO

[2]

2-#

[3]

BARRA AL, 1996, EUROPHYS LETT, V35, P134

[4] Neutron spectroscopy for the magnetic anisotropy of molecular clusters [J].

Caciuffo, R ;

Amoretti, G ;

Murani, A ;

Sessoli, R ;

Caneschi, A ;

Gatteschi, D .

PHYSICAL REVIEW LETTERS, 1998, 81 (21) :4744-4747

[5] MAGNETIC-PROPERTIES OF AN OCTANUCLEAR IRON(III) CATION [J].

DELFS, C ;

GATTESCHI, D ;

PARDI, L ;

SESSOLI, R ;

WIEGHARDT, K ;

HANKE, D .

INORGANIC CHEMISTRY, 1993, 32 (14) :3099-3103

[6] Macroscopic measurement of resonant magnetization tunneling in high-spin molecules [J].

Friedman, JR ;

Sarachik, MP ;

Tejada, J ;

Ziolo, R .

PHYSICAL REVIEW LETTERS, 1996, 76 (20) :3830-3833

[7] LARGE CLUSTERS OF METAL-IONS - THE TRANSITION FROM MOLECULAR TO BULK MAGNETS [J].

GATTESCHI, D ;

CANESCHI, A ;

PARDI, L ;

SESSOLI, R .

SCIENCE, 1994, 265 (5175) :1054-1058

[8] Non-exponential relaxation in a resonant quantum tunneling system of magnetic molecules [J].

Ohm, T ;

Sangregorio, C ;

Paulsen, C .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1998, 113 (5-6) :1141-1146

[9] Quantum tunneling of the magnetization in an iron cluster nanomagnet [J].

Sangregorio, C ;

Ohm, T ;

Paulsen, C ;

Sessoli, R ;

Gatteschi, D .

PHYSICAL REVIEW LETTERS, 1997, 78 (24) :4645-4648

[10]

SESSOLI R, COMMUNICATION

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