Magnetic anisotropy is responsible for the single molecule magnet behavior of transition metal complexes. This behavior is characterized by a slow relaxation of the magnetization for low enough temperatures, and thus for a possible blocking of the magnetization. This bistable behavior can lead to possible technological applications in the domain of data storage or quantum computing. Therefore, the understanding of the microscopic origin of magnetic anisotropy has received a considerable interest during the last two decades. The presentation focuses on the determination of the anisotropy parameters of both mono-nuclear and bi-nuclear types of complexes and on the control and optimization of the anisotropic properties. The validity of the model Hamiltonians commonly used to characterize such complexes has been questioned and it is shown that neither the standard multispin Hamiltonian nor the giant spin Hamiltonian are appropriate for weakly coupled ions. Alternative models have been proposed and used to properly extract the relevant parameters. Rationalizations of the magnitude and nature of both local anisotropies of single ions and the molecular anisotropy of polynuclear complexes are provided. The synergy and interference effects between local magnetic anisotropies are studied in a series of binuclear complexes.

1.
Sessoli
,
R.
, et al. 
J. Am. Chem. Soc.
115
,
1804
(
1993
).
2.
Sessoli
,
R.
;
Gatteschi
,
D.
;
Caneschi
,
A.
;
Novak
,
M. A. Nature
365
,
141
(
1993
).
3.
Gatteschi
,
D.
,
Sessoli
,
R.
and Villain,
J.
Molecular
.
Molecular Nanomagnets
. s.l.:
Oxford University Press
:
New York
, (
2006
)
and references therein
.
4.
Milios
,
C. J.
, et al. 
J. Am. Chem. Soc.
129
,
2754
(
2007
).
5.
Yoshihara
,
D.
,
Karasawa
,
S. et
Koga
,
N. J. Am. Chem. Soc.
130
,
10460
(
2008
).
6.
Mannini
,
M.
;
Pineider
,
F.
;
Sainctavit
,
P.
;
Danieli
,
C.
;
Otero
,
E.
;
Sciancalepore
,
C. A.
;
Talarico
,
M.
;
Arrio
,
M.-A.
;
Cornia
,
A.
;
Gatteschi
,
D.
;
Sessoli, R. Nat. Mater.
8
,
194
(
2009
).
7.
Leuenberger
,
M. N.
and
Loss
,
D. Nature.
410
,
789
(
2001
).
8.
Ardavan
,
A.
;
Rival
,
O.
;
Morton
,
J. J. L.
;
Blundell
,
S. J.
;
Tyryshkin
,
A.M.
;
Timco
,
G. A.
;
Winpenny
,
R. E. P. Phys. Rev. Lett.
98
,
057201
(
2007
).
9.
Stamp,
P. C. E. et
Gaita-Arino
,
A. J. Mater. Chem.
19
,
1718
(
2009
).
10.
Ishikawa
,
N.
;
Sugita
,
M.
;
Ishikawa
,
T.
;
Koshihara
,
S.-Y.
;
Kaizu
,
Y. J. Am. Chem. Soc.
125
,
8694
(
2003
).
11.
Ishikawa
,
N.
;
Sugita
,
M.
;
Ishikawa
,
T.
;
Koshihara
,
S.
;
Kaizu
,
Y. J. Phys. Chem. B
108
,
11265
(
2004
).
12.
AlDamen
,
M. A.
, et al. 
J. Am. Chem. Soc.
130
,
8874
(
2008
).
13.
AlDamen
,
M. A.
, et al. 
Inorg. Chem.
48
,
3467
(
2009
).
14.
Rinehart
,
J. D.
and
Long
,
J. R. J. Am. Chem. Soc.
131
,
12558
(
2009
).
15.
Maurice
,
R.
, et al. 
Journal of Chemical Theory and Computation
5
,
2977
2984
(
2009
).
16.
Maurice
,
R.
, et al. 
Journal of Chemical Physics
133
,
084307
(
2010
).
17.
Maurice
,
R.
, et al. 
Inorganic Chemistry
50
,
11075
11081
(
2011
).
18.
Costes
,
J.-P.
, et al. 
Chemistry−A European Journal
18
,
4031
4040
(
2012
).
19.
Ruamps
,
R.
, et al. 
Chemistry−A European Journal
19
,
950
956
(
2013
).
20.
Ruamps
,
R.
, et al. 
Journal of the American Chemical Society
135
,
3017
3026
(
2013
).
21.
Bogdanov
,
N. A.
, et al. 
Phys. Rev. Lett.
110
,
127206
(
2013
).
22.
Maurice
R.
, et al. 
Inorg. Chem.
52
,
9379
9389
(
2013
).
23.
Maurice
,
R.
, et al. 
Physical Chemistry Chemical Physics
15
,
18784
18804
(
2013
).
24.
Ruamps
,
R.
, et al. 
Chemical Science
5
,
3418
3424
(
2014
).
25.
Maurice
,
R.
, et al. 
Journal of Chemical Theory and Computation
6
,
55
65
(
2010
).
26.
Maurice
,
R.
, et al. 
Physical Review B
81
,
214427
(
2010
).
27.
Maurice
,
R.
, et al. 
Journal of Chemical Theory and Computation
6
,
3092
3101
(
2010
).
28.
Maurice
,
R.
, et al. 
Inorganic Chemistry
50
,
6229
6236
(
2011
).
29.
Pradipto
,
A. M.
, et al. 
Physical Review B
85
,
014409
(
2012
).
30.
Maurice
,
R.
, et al. 
Physical Review B
86
,
024411
(
2012
).
31.
Ruamps
,
R.
, et al. 
Inorganic Chemistry
53
,
4508
4516
(
2014
).
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