Electron paramagnetic resonance (EPR) and scanning electron microscopy (SEM) methods were used to study polyethylene terephthalate (PET) films implanted with 60 keV phosphorus ions in the dose range of 100–2000 μC/cm^2. The effect of irradiation on paramagnetism and on the change in the conductive properties of PET films was detected by a change in the frequency of the resonator and the amplitude of the EPR signal of a reference ruby sample controlling the quality factor of the resonator. It was found that the EPR signal in the spectra of irradiated films has a maximum intensity when implantation of phosphorus ions with a dose of 1000 μC/cm^2. The maximum losses in the resonator, indicating the presence of a conducting phase in the sample, are observed when measuring a PET film implanted with phosphorus ions with a dose of 200 μC/cm^2. Using SEM, it was found that when the samples are irradiated with phosphorus ions, carbon clusters are formed already at a dose of 200 μC/cm^2. The formation of a conductive layer in PET is indicated by a decrease in the frequency of the resonator and the amplitude of the EPR signal of the ruby standard. The dependence of the amplitude of the EPR signal of the standard, both on the dose of implanted ions and on the position of the implanted film relative to the direction of the external polarizing magnetic field, was found. The anisotropy of the paramagnetic properties of PET films implanted with phosphorus ions may indirectly indicate a magnetoresistive effect in them.

Samples of detonation nanodiamonds modified during the synthesis by adding doping elements in various ways have been studied by spectroscopic methods (electron paramagnetic resonance, Raman scattering, and X-ray diffraction). For the first time, the presence of P1 centers in detonation nanodiamond crystals has been indirectly demonstrated. The authors discuss the nature and distribution of spins as observed by the electron paramagnetic resonance, the composition of phases and size of the coherent scattering region, and crystal density (calculated by the X-ray method) of the detonation nanodiamond samples at hand.

We have studied the electron spin resonance (ESR) of a 0.59 carat synthetic diamond single crystal at room temperature. The crystal was grown on a “split-sphere” apparatus in the Fe-Ni-C system by the temperature gradient method. After high-temperature/high-pressure treatment of the diamond, it was observed that as the microwave power supplied to the sample increased from 70 μW to 70 mW in an H102 cavity, the ESR signal from the P1 center (a nitrogen atom substituting for carbon at a lattice point of the diamond crystal: C-form nitrogen) is inverted. In the original diamond (before high-temperature/high-pressure treatment), no inversion of the ESR signal was observed.

Crystalline grains of type IIa natural diamond (the average grain mass is ∼1 mg) are studied after their irradiation with neutrons in a nuclear reactor at a neutron fluence of ∼10 21 cm −2 . The irradiation is found to bring about a decrease in the macroscopic density of the grains by 40%. A quadrature signal of electron spin resonance (ESR) with a g factor equal to 2.00006 and a paramagnetic-relaxation time > 10 −5 s is detected for the first time. Metastable uncompensated electron spins residing at the inner surface of the nanovoids may be the cause of the appearance of this signal. A similar signal is also observed for C 60 fullerite powder. The results of an ESR spectroscopy study of the irradiated diamonds are consistent with data obtained from Raman scattering spectroscopy (the appearance of an anomalously broad band peaked at 950 cm −1 instead of a narrow single line at 1332 cm −1 in the initial sample) and electron microscopy (the appearance of nanostructuring). It is established that nanostructuring of diamond under the effect of ionizing radiation brings about the appearance of dc electrical conductivity with an activation energy of 0.17 eV in the temperature range 30 to 300°C.

Electron paramagnetic resonance (EPR) in diamond single crystals was studied. The crystals were grown using apparatuses of the “split-sphere” type in a Ni-Fe-C system using the temperature gradient method with a subsequent high-temperature high-pressure treatment. It was found that, after the high-temperature high-pressure treatment of a diamond sample, the EPR signal from the lattice defects containing nitrogen atoms became inverted with the growth of the microwave power in an H102 resonator. In a constant polarizing magnetic field, when the microwave power applied to the diamond was low, a resonance absorption by the nitrogen defects took place, whereas, when the microwave power was high, an emission was observed. The inversion of the EPR lines of a single nitrogen atom substituting for a carbon atom at a diamond lattice site could be caused by the presence of a nickel atom with an uncompensated magnetic moment at the adjacent tetrahedral interstitial site. In synthetic diamond crystals that were not subjected to high-temperature high-pressure treatment, the inversion of the EPR signal from nitrogen atoms (P1 centers, nitrogen in the C form) was absent.

By comparing the signals of electron spin resonance (ESR) from two crystals of a diamond (spin–labels) the demagnetizing field of the Co, Fe, and Ni samples in the shape of strongly elongated ellipsoids of revolution (disks) has been measured. The magnetic permeabilities of the metals in the external magnetic field corresponding to the ESR of the broken chemical bonds in a natural diamond irradiated with fast reactor neutrons have been determined.

The aim of the present work was to investigate the effect of zirconium and carbon implantation on iron films. Tribological properties, element and phase composition of iron thin-film samples during monoelement [C+, Zr+→ Fe], subsequent [Zr+ → (C+ → Fe), C+ → (Zr+ → Fe)] and joint [C+ + Zr+) → Fe] implantation were investigated.