Related Experiment Video
Updated: May 9, 2026
06:49
Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
Published on: April 12, 2019
Strain-induced ferromagnetism in antiferromagnetic LuMnO3 thin films
1Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
Physical Review Letters
|August 6, 2013
Summary
Strained lutetium manganite (LuMnO3) thin films exhibit coexisting ferromagnetic and antiferromagnetic orders. This strain-induced ferromagnetism, absent in bulk, is coupled to antiferromagnetism, enabling multifunctional devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thin Film Technology
Background:
- Bulk lutetium manganite (LuMnO3) exhibits antiferromagnetic ordering.
- Understanding strain effects in rare-earth manganite thin films is crucial for device applications.
Purpose of the Study:
- To investigate the magnetic properties of strained LuMnO3 thin films.
- To explore the coexistence and coupling of magnetic orders in these films.
- To assess the potential of strained LuMnO3 for multifunctional devices.
Main Methods:
- Synthesis of single-phase strained LuMnO3 thin films.
- Magnetic characterization to identify ferromagnetic and antiferromagnetic orders.
- Analysis of magnetic moment distribution and interfacial effects.
Main Results:
- Coexisting ferromagnetic and antiferromagnetic orders were observed in strained LuMnO3 thin films.
- A significant ferromagnetic moment (≈1μB), absent in bulk, was detected, localized at the substrate-film interface.
- Strain-induced ferromagnetism and antiferromagnetism were found to be coupled via an exchange field.
Conclusions:
- Strained LuMnO3 thin films present a unique platform for observing coupled magnetic phenomena.
- The interfacial magnetic properties highlight the role of strain engineering.
- These films are promising candidates for developing novel multifunctional magnetic devices.
Related Concept Videos
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
01:30Paramagnetism
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
01:15Lenz's Law
The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux through the coil...
If a bar magnet is moved toward a coil such that the magnetic flux through the coil...
01:05Atomic Nuclei: Magnetic Resonance
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...