EFFECTS OF IN-PLANE STRAIN ON MAGNETISM IN  LaMnO3 THIN FILMS

The effects of the in-plane strain on the magnetic properties of LaMnO3 thin films are calculated using an elastic energy expression and a tight binding Hamiltonian with electron-lattice coupling. Tensile uniaxial strain of the order of 2%, which is the order of the magnitude of those induced in thin films by lattice mismatch with substrates, is found to change the magnetic ground state from A-type antiferromagnetic state to purely antiferromagnetic state.

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Influence of the supramolecular architecture on the magnetic properties of a DyIII single-molecule magnet: an ab initio investigation

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.5.236 ◽

2014 ◽

Vol 5 ◽

pp. 2267-2274 ◽

Cited By ~ 19

Author(s):

Julie Jung ◽

Olivier Cador ◽

Kevin Bernot ◽

Fabrice Pointillart ◽

Javier Luzon ◽

...

Keyword(s):

Hydrogen Bond ◽

Magnetic Properties ◽

Single Molecule ◽

Ground State ◽

Supramolecular Interactions ◽

Supramolecular Organization ◽

Supramolecular Architecture ◽

Magnetic Ground State ◽

Single Molecule Magnet ◽

Hydrogen Bond Networks

Single-crystal angular-resolved magnetometry and wavefunction-based calculations have been used to reconsider the magnetic properties of a recently reported DyIII-based single-molecule magnet, namely [Dy(hfac)3(L1)] with hfac− = 1,1,1,5,5,5-hexafluoroacetylacetonate and L1 = 2-(4,5-bis(propylthio)-1,3-dithiol-2-ylidene)-6-(pyridin-2-yl)-5H-[1,3]dithiolo[4',5':4,5]benzo[1,2-d]imidazole. The magnetic susceptibility and magnetization at low temperature are found to be strongly influenced by supramolecular interactions. Moreover, taking into account the hydrogen-bond networks in the calculations allows to explain the orientation of the magnetic axes. This strongly suggests that hydrogen bonds play an important role in the modulation of the electrostatic environment around the DyIII center that governs the nature of its magnetic ground-state and the orientation of its anisotropy axes. We thus show here that SMM properties that rely on supramolecular organization may not be transferable into single-molecule devices.

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Epitaxial Growth and Magnetic Behavior of (Ni,Zn)Fe2O4 Thin Films on Si Substrate Using Designed Buffer Layers for Novel Memory Application

MRS Proceedings ◽

10.1557/proc-747-t3.4 ◽

2002 ◽

Vol 747 ◽

Author(s):

Naoki Wakiya ◽

Kazuo Shinozaki ◽

Nobuyasu Mizutani

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Remanent Magnetization ◽

Zinc Ferrite ◽

Lattice Mismatch ◽

Magnetic Behavior ◽

Buffer Layers ◽

Si Substrate ◽

Antiphase Boundaries ◽

Nickel Zinc

ABSTRACTEpitaxial nickel zinc ferrite (Ni,Zn)Fe2O4 (NZF) thin films were successfully deposited on (MgO-Al2O3)/CeO2/YSZ/Si(001) substrates, where (MgO-Al2O3) is MgO doped with Al2O3. The crystallographic orientation and magnetic properties (saturation magnetization: Ms, and squareness: Mr/Ms where Mr is remanent magnetization) of NZF thin films were considerably changed with the amount of Al2O3 addition. If the amount of Al2O3 addition was less than 7 mol%, (001)-oriented epitaxial NZF thin films were obtained and the films had low squareness (around 45%). If the amount of Al2O3 addition was more than 7 mol%, (111)-oriented epitaxial NZF thin films were obtained and the films had high squareness (around 60–81%). Maximum squareness (81%) was obtained if the amount of Al2O3 addition was 26 mol%. For the sample with this Al2O3 content, the lattice mismatch between NZF and (MgO-Al2O3) buffer layer was 3.2%. The fact that high squareness was not obtained if lattice mismatch was very small (-0.3% on MgO) but obtained if lattice mismatch was 3.2% suggests that lattice mismatch to a certain content is important to avoid the formation of antiphase boundaries (APBs). This consideration was confirmed by examining other buffer layers having various lattice mismatches with NZF.

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Modified Magnetic Ground State in Nimn (2) O (4) Thin Films

10.2172/1049759 ◽

2012 ◽

Author(s):

B.B. Nelson-Cheeseman ◽

R.V. Chopdekar ◽

J.M. Iwata ◽

M.F. Toney ◽

E. Arenholz ◽

...

Keyword(s):

Thin Films ◽

Ground State ◽

Magnetic Ground State

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Effects of film thickness and lattice mismatch on strain states and magnetic properties of La0.8Ca0.2MnO3 thin films

Journal of Applied Physics ◽

10.1063/1.370484 ◽

1999 ◽

Vol 85 (8) ◽

pp. 4794-4796 ◽

Cited By ~ 84

Author(s):

R. A. Rao ◽

D. Lavric ◽

T. K. Nath ◽

C. B. Eom ◽

L. Wu ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Film Thickness ◽

Lattice Mismatch

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Signatures of Non-integer 5f Occupancy in Pu Systems: Magnetic Properties and Photoelectron Spectroscopy Studies

MRS Proceedings ◽

10.1557/proc-1104-nn08-05 ◽

2008 ◽

Vol 1104 ◽

Author(s):

Ladislav Havela ◽

Alexander Shick ◽

Thomas Gouder ◽

Franck Wastin ◽

Jean Rebizant

Keyword(s):

Magnetic Properties ◽

Ground State ◽

Photoelectron Spectroscopy ◽

Magnetic Moments ◽

Mean Field ◽

Magnetic Ground State ◽

Final State ◽

Large Group ◽

Spectroscopy Studies ◽

Quantitative Explanation

AbstractVery diverse Pu compounds exhibit strikingly universal features in their valence-band photoemission (PES) spectra. The conjecture that such features represent the 5f5 final state multiplet has been corroborated by LDA+Hubbard I calculations, meaning that the ground state has a mixed 5f5-5f6 character. Later on, more elaborated DMFT techniques (one crossing approximation, QMC) led to similar conclusions, providing quantitative explanation of such intermeate-valent situation in more details. Analogies in PES spectra of δ-Pu and other Pu systems suggest that the situation envisaged for δ-Pu is relevant for a large group of Pu compounds. Here we show that the around mean field LDA+U in conjunction with the Hubbard I approximation, which describes well the non-magnetic ground state for δ-Pu, captures in reality properties of a large group of Pu (as well as e.g. Am) compounds, reproducing correctly the onset of magnetism and size of magnetic moments.

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Magnetic ground state and pressure effect study on elasticity, electronic and magnetic properties of KUO3: DFT+U, GLLB-SC, mBJ and QTAIM investigations

Solid State Sciences ◽

10.1016/j.solidstatesciences.2019.02.001 ◽

2019 ◽

Vol 90 ◽

pp. 56-67 ◽

Cited By ~ 3

Author(s):

A. Dorbane ◽

H. Bouafia ◽

B. Sahli ◽

B. Djebour ◽

A. Bouaza ◽

...

Keyword(s):

Magnetic Properties ◽

Ground State ◽

Pressure Effect ◽

Effect Study ◽

Magnetic Ground State ◽

Electronic And Magnetic Properties

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Lattice Distortions and Domain Structure in Epitaxial Manganite Thin Films

MRS Proceedings ◽

10.1557/proc-602-207 ◽

1999 ◽

Vol 602 ◽

Author(s):

Y. Suzuki ◽

Yan Wu ◽

U. Rüdiger ◽

J. Yu ◽

A.D. Kent ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Hydrostatic Pressure ◽

Magnetic Anisotropy ◽

Domain Structure ◽

Colossal Magnetoresistance ◽

Lattice Mismatch ◽

Magnetic Domain ◽

Lattice Distortions

AbstractLattice distortions, be they in the form of chemical and hydrostatic pressure in bulk or lattice mismatch between film and substrate, have significant effects on the transport as well as the magnetic properties of colossal magnetoresistance (CMR) materials. We summarize here our results on tensilely and compressively strained La0.7Sr0.3MnO3 (LSMO) thin films that indicate the important role of lattice distortions due to the lattice mismatch between the film and substrate. The strain due to lattice distortions can be used to tune the magnetic domain structure, magnetization, magnetic anisotropy and magnetotransport of LSMO thin films.

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Magnetic Properties Of Tdae-C60: Remanence and Relaxation

MRS Proceedings ◽

10.1557/proc-413-333 ◽

1995 ◽

Vol 413 ◽

Author(s):

M. Tokumoto ◽

Y. S. Song ◽

K. Tanaka ◽

T. Sato ◽

T. Yamabe

Keyword(s):

Magnetic Properties ◽

Temperature Dependence ◽

Spin Glass ◽

Ground State ◽

Freezing Temperature ◽

Squid Magnetometer ◽

Zero Field ◽

Relaxation Phenomena ◽

Magnetic Ground State ◽

Low Field

ABSTRACTPrecise measurements of low-field magnetization of TDAE-C60 (TDAE; tetrakis(dimethylamino)ethylene) by SQUID magnetometer revealed a clear “remanence” or “irreversibility”, i.e. difference in the temperature dependence between zero-field cooled (ZFC) and field cooled (FC) conditions below the freezing temperature Tf around 10 K. Also, an extremely slow relaxation phenomena of magnetization was observed. These “glassy” characteristics are reminiscent of a “spin-glass” with Tf at about 10 K as the nature of the magnetic ground state of TDAE-C60.

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